Definition
A Latin term from the Roman legal tradition meaning construction — specifically, the act or method of interpreting a legal instrument, document, or provision in order to determine its meaning and legal effect. In classical legal usage, constructio refers to the interpretive work performed by courts or by operation of law when the plain meaning of a text is ambiguous, incomplete, or capable of multiple readings.
The term appears most prominently in the maxim Constructio legis non facit injuriam — "The construction of the law works no injury" — which expresses the principle that when law supplies an interpretation of an instrument, that interpretation is deemed just and does not give rise to a legal wrong against either party. Courts applying this principle read ambiguous instruments in the manner least likely to produce hardship or inequity.
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Common Confusion
CONSTRUCTIO and CONSTRUCTION: Constructio is the Latin root from which the English legal term "construction" directly derives. Modern legal sources use construction almost exclusively; constructio appears in Latin maxims, Coke's commentaries, and older common law materials. Researchers encountering constructio in historical sources should treat it as functionally equivalent to construction in its interpretive sense, not in the architectural or structural sense. See CONSTRUCTION.
Constructio should also be distinguished from INTERPRETATIO, the related Latin term for interpretation. Though often used interchangeably in historical sources, some civil law writers drew a distinction: interpretatio referred to determining the literal or textual meaning of a provision, while constructio implied a more active inference beyond the text — filling gaps or resolving ambiguities by reference to the law's purpose or spirit.
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Why It Matters in Research
Researchers in the Law Mind corpus will encounter constructio primarily in three contexts: Latin maxims cited in early American and English opinions, Coke's Institutes and the commentators who followed him, and civil law treatises drawing on Roman and canon law sources.
The maxim Constructio legis non facit injuriam is the most practically significant phrase in which this term appears. Understanding it requires knowing that constructio here means not merely reading a document but the interpretive result produced by law itself — the construction law imposes when parties have not made their meaning clear. Burrill cites Co. Litt. 183 and Broom's Legal Maxims, both of which are standard shelf sources for tracing how this principle moved from Roman doctrine into English common law and then into American practice.
A research trap: in early sources, constructio and interpretatio appear interchangeably, but later common law writers, particularly in the eighteenth and nineteenth centuries, refined construction to mean something more active than interpretation — a distinction that became important in American constitutional and statutory interpretation debates. Researchers reading older materials citing constructio should be cautious about importing that refined modern distinction backward into historical texts.
The term also signals a civil law influence. When constructio appears in a primarily common law source, it often marks a point where the author is drawing on Romanist scholarship. This can be a useful trail marker for identifying where common law doctrine absorbed civilian concepts.
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Historical Dictionary Support
Burrill's Law Dictionary provides the essential entry: a direct translation ("Construction"), the Coke citation, the Broom citation, and a plain-English gloss on the operative effect of the maxim. Burrill's treatment is characteristically economical — it gives researchers the hook they need to follow the maxim into its primary sources without extended commentary.
What Burrill does not do is trace the distinction between constructio and interpretatio or address the tension between strict and liberal construction that occupied later common law writers. For that development, researchers must move to Broom's Legal Maxims directly, or to Story and Kent for American treatment of construction principles.
The Coke citation (Co. Litt. 183) places this maxim firmly in the seventeenth-century common law synthesis that shaped how English and American courts understood the relationship between legal interpretation and equitable outcomes. Broom's Legal Maxims at page 259 provides the most accessible secondary treatment of the principle as it had crystallized by the mid-nineteenth century.
No significant divergence among historical sources on the core meaning — the term is stable in its narrow technical sense. The principal limitation of historical dictionary entries is simply that they record the term as Latin shorthand without unpacking the interpretive tradition behind it.
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Encyclopedia Cross-Reference
Law Mind Encyclopedia: Statutory Interpretation; Legal Maxims; Construction of Instruments
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