Canons of Construction in Massachusetts

Every canon is a prediction about how your language will be read after you are done with it. This is the order they get applied in, and what beats what.

1. The tiers are a sequence, not a menu

Canons are usually presented as a list. That is how they get misused. In practice they run in an order, and each step has a stop rule: if the analysis resolves, you do not descend to the next tier — and an argument that skips a tier to reach a friendlier canon is the most common losing move in a brief.

1. Read the text

   Ordinary meaning, the definitions section, terms of art, the whole act. Most disputes end here. Where the language is unambiguous it is conclusive, and everything below is surplus argument.

2. Test it against the structure

   Does the reading survive the rest of the act? Structural canons reinforce or qualify the textual reading; they rarely displace it. Absurdity can, but the threshold is high.

3. Only then, subject matter

   Lenity, remedial construction, strict construction of tax exemptions and immunity waivers. These activate on genuine residual ambiguity, in their own domain, and not otherwise.

4. Outside the text, last

   Legislative history, agency practice, dictionaries. Tie-breakers and confirmation. They cannot contradict text that is clear.

One canon does not keep its place in that order. Constitutional avoidance carries first-tier weight whenever the constitutional question is a serious one, wherever it would otherwise sit.

2. Tier one — the text

Presumptively controlling, and where the great majority of decided cases end. If you learn two canons, learn plain meaning and surplusage: the first decides most cases, and the second is the answer to most attempts at a narrow reading.

Plain meaning

Words carry their ordinary, everyday meaning, and where the language is unambiguous it is conclusive of legislative intent.

Triggers on an undefined term in common usage, with no competing definition in the act. Yields to a statutory definition, an established term of art, or a genuinely absurd result — and to nothing else.

Technical meaning

Words that have acquired a peculiar and appropriate meaning in law, or in a trade, are construed according to that meaning rather than lay usage.

Triggers on terms of art, and on language borrowed from another chapter or from the common law. Yields to context showing the Legislature used the word loosely, or a definition in the act to the contrary.

Negative implication — expressio unius est exclusio alterius

The expression of one thing implies the exclusion of others. What the Legislature could have listed and did not is presumptively outside the statute.

Triggers on a closed enumeration, and on a term that appears in a neighboring section but not this one. Yields to a list drafted as illustrative, and to any reading the whole act contradicts. Moderate strength — routinely overcome, and rarely the strongest thing in the brief.

Ejusdem generis

A general term closing a list of specifics is limited to things of the same kind as those specified.

Triggers on a catch-all following an enumeration whose members share an evident common attribute. Yields to the plain meaning of the general term itself. It is a guide, not a rule: in Desrosiers v. Governor, 486 Mass. 369 (2020), the plaintiffs argued that "other natural causes" in the Civil Defense Act was cabined by the specific causes preceding it; the court declined to narrow unambiguous language that produced no absurd result.

Noscitur a sociis

A word is known by the company it keeps; an unclear term takes its color from those around it.

Triggers on a broad word sitting in a series of narrower ones. Yields to a definition in the act, and to a series whose members share no coherent theme.

Consistent usage

A term bears the same meaning throughout the act, and a material variation in wording signals a variation in meaning.

Triggers on the same word in two sections, or a deliberate switch of terms between adjacent provisions. Yields to a section-specific definition, or evidence that the act was assembled from separate drafts.

Whole act

A provision is read in the context of the entire act, including its structure, its title, and the scheme it amends.

Triggers whenever a proffered reading works only if the section is read alone. Yields to little; it more often qualifies other canons than loses to them.

Surplusage

Every word and provision is given effect. No reading should render language redundant or inoperative.

Triggers on any construction under which a clause, a proviso, or a defined term would do no work. Yields to acknowledged belt-and-suspenders drafting — but the court will want a reason. Frequently determinative, and the strongest answer to an over-narrow reading.

Fixed meaning

Words carry the meaning they bore when the text was adopted, not meanings acquired since.

Triggers on older statutes, and on terms whose usage has drifted — technological, medical, financial. Yields to language the Legislature framed in deliberately dynamic terms.

Grammar

Words are given the meaning ordinary grammar and usage assign them, including punctuation, tense, and number.

Triggers on disputes over the reach of a comma, a proviso, or a conjunction. Yields to evident drafting error, and to the whole-act reading.

Last antecedent

A limiting clause or phrase modifies only the noun or phrase immediately preceding it.

Triggers on a trailing "which," "that," or qualifying phrase after a list. Yields to the series-qualifier canon wherever the construction is straightforwardly parallel. This pair is the most common canon collision in briefing.

Series qualifier

Where a parallel series of nouns or verbs carries a modifier at one end, the modifier applies to the whole series.

Triggers on genuinely parallel items, uniform in grammatical form. Yields to non-parallel construction, which routes to the nearest reasonable referent instead.

Nearest reasonable referent

Where the syntax is not a parallel series, a modifier attaches to the nearest referent that can sensibly bear it.

Triggers on mixed constructions, and on a pronoun with more than one candidate antecedent. Yields to a reading the surrounding provisions make untenable.

3. Tier two — the structure

These qualify the textual reading and resolve conflict inside the act. They support plain meaning far more often than they override it.

Whole text

The statute is read as an integrated whole, each section informing the others. Use it to show that a proffered reading works only in isolation.

Harmonious reading

Provisions are construed so as to be compatible rather than contradictory, and repeal by implication is disfavored. Strong in exactly the posture where two provisions appear to collide.

Specific over general — generalia specialibus non derogant

Where a specific provision conflicts with a general one, the specific controls as an exception. Use it for a targeted section operating inside a broad scheme.

Legislative purpose

The statute is construed to effectuate the purpose disclosed by its text, its structure, and any preamble. It supports; it rarely overrides. Purpose untethered from text is the weakest argument in the brief.

Absurdity

A construction producing an absurd or unworkable result is rejected even where it is literally available. The threshold is what the Legislature could not rationally have intended — not what a party would rather avoid.

4. Tier three — subject matter

Three conditions, all of them required: residual ambiguity after tiers one and two, subject matter inside the canon's domain, and a dispute the canon's rationale actually reaches. None of these overrides clear text, and arguing one as though it does invites the court to say so.

Rule of lenity

A criminal statute still genuinely ambiguous after the ordinary tools are exhausted is construed in the defendant's favor. A tie-breaker of last resort, not a thumb on the scale from the outset.

Remedial construction

Remedial statutes — consumer, employment, wage — are construed liberally to effectuate their protective purpose. Collides head-on with lenity where a remedial scheme carries criminal penalties.

Derogation of the common law

A statute displacing the common law is construed strictly. Abrogation is not presumed beyond what the text requires.

Tax exemptions construed narrowly

Exemptions are strictly construed against the party claiming them; entitlement must be clear.

Tax impositions construed strictly

Doubt whether a tax reaches a transaction is resolved against imposition. Runs in the opposite direction from the exemption canon — identify which side of the line the dispute sits on before invoking either.

Sovereign immunity

A waiver of the Commonwealth's immunity is strictly construed and must be express. Consent to suit is never implied.

Constitutional avoidance

Where one reading raises serious constitutional doubt and another does not, the latter is adopted if it is fairly available. The one subject-matter canon that outranks its tier: a substantial constitutional question gives it first-tier weight. It operates only among fairly available readings — it does not license rewriting clear text to save a statute.

Codified liberal construction

Some acts direct their own construction, and where the General Court has said so expressly that instruction displaces the background presumption. G.L. c. 119, § 53 is the standing example: juvenile provisions are to be liberally construed.

Construction against the insurer

Ambiguity in an insurance provision is resolved against the drafting insurer and in favor of coverage.

Presumption against retroactivity

A statute operates prospectively unless the General Court has made it retrospective in terms so clear as to leave no doubt. Procedural and remedial changes are treated more permissively than provisions disturbing vested rights. The drafting corollary is short: if you mean it to reach back, say so in the section, not in the preamble.

Reenactment

Where the General Court reenacts or amends language that has been judicially construed, without disturbing the construction, it is presumed to have adopted it. This one cuts both ways at the drafting desk: reenacting settled language imports the gloss, whether or not you want it.

5. Tier four — outside the text

Available only where the intrinsic analysis is inconclusive. Typically confirmatory, and never good against clear text.

Legislative history

Committee reports, predecessor drafts, and the sequence of amendments may illuminate an ambiguous provision. Thinner in Massachusetts than in federal practice. What survives best: language struck during passage, and the difference between the filed and the engrossed text.

Agency interpretation

The construction given by the agency charged with administering a statute is entitled to substantial deference — deference, not abdication. An interpretation contrary to the statute's plain terms gets none.

Practical construction

Long-settled administrative practice under a statute, known to the General Court and left undisturbed, supports that reading.

Dictionary definitions

Dictionaries current at enactment establish ordinary meaning; they support plain meaning rather than standing on their own. Competing dictionaries usually mean the term is ambiguous — which is itself the finding.

6. What the General Court has already codified

Several construction rules are not presumptions at all in Massachusetts. They are statute, and they are cited too rarely. Check them before you argue the common-law version of the same point.

That single clause is the statutory basis for both plain meaning and technical meaning. Cite the clause, not just the canon — it is the difference between a rule the court must apply and a maxim it may weigh.

Read § 7 before you draft a bespoke definition. Duplicating what is already there invites a surplusage argument you did not need to have; departing from it silently invites a worse one.

Before you cite it: the quotations above were taken from the General Laws as published by the General Court and are reproduced here for orientation. Pull the current text yourself before it goes into a brief or a bill.

7. Where the canons collide

Canons come in opposing pairs. Naming the tension and resolving it is stronger than pretending only one of them applies — the court is going to see both.

Three decisions worth keeping in mind

Each is a case where the canon a drafter would have predicted did not carry the day.

Desrosiers v. Governor, 486 Mass. 369 (2020) — plain meaning over an apparent ejusdem generis limitation. The specific causes preceding "other natural causes" in the Civil Defense Act did not cabin the general term.

Commonwealth v. Mansur, 484 Mass. 172 (2020) — the court overruled the narrow test of Giannino (1977), which had construed "relating to the operation or control of motor vehicles" in G.L. c. 90C, § 1 to require a violation that necessarily and exclusively involved operation or control. That gloss, the court said, departed from the plain language of the statute and did so without any analysis. An untextual gloss can sit in the reports for forty-three years and still lose.

Oracle USA, Inc. v. Commissioner of Revenue, 487 Mass. 518 (2021) — "may" in a delegation went to the manner of implementation, not to whether the thing is available at all. The Legislature had decided the policy question and delegated only how it is carried out; reading "may" as discretion over whether would have raised a separation-of-powers problem under art. 30.

8. Reading it backwards, at the drafting desk

Every canon above is a prediction about language you are writing now. The ones that generate the most litigation are the most avoidable.

9. Where the ordering comes from

The tiers on this page are not a hierarchy any court has adopted, and no opinion will tell you that lenity sits in the third tier. The ordering is drawn from a corpus of Massachusetts appellate statutory-interpretation decisions, coded for which canons the court actually used, in what order, and how firmly it resolved the question — the same corpus behind the interpretation work described in the method and the drafting tools. What the coding shows is consistent enough to draft against: the text decides most cases, structure qualifies it, subject-matter canons wait on ambiguity that survives both, and extrinsic sources confirm rather than decide.

For the drafting side of the same question — the language that creates the ambiguity in the first place — see the effective dates guide and the worked example in the casebook.

Educational, and a starting point for a lawyer's judgment rather than a substitute for it. Statutory text and case holdings should be verified against the current sources before they are relied on.