Definition
Contemporanea (short for contemporanea expositio) is a canon of legal construction holding that the interpretation placed on a statute, custom, or other legal instrument at or near the time of its creation carries special authority. The principle rests on the assumption that those closest in time to the making of a law understood its meaning most accurately. Courts applying this canon look to early administrative practice, the conduct of officials charged with carrying out a new enactment, or the usage of those subject to a custom as evidence of what the law originally meant.
The principle is most commonly invoked in its full Latin form: Contemporanea expositio est optima et fortissima in lege — "Contemporaneous exposition is the best and strongest in the law." This maxim derives from Coke's commentary on Littleton and has circulated through common-law jurisprudence for centuries as a guide to statutory and customary interpretation.
Common Confusion
Contemporanea is sometimes used interchangeably with the broader term expositio (exposition or construction generally) and with the doctrine of practical construction. These are related but distinct. Expositio covers interpretive methods generally; practical construction refers specifically to how a law has been applied by executive or administrative actors over time, which may or may not coincide with the contemporaneous moment. Contemporanea is narrower: it privileges the interpretive moment of origin, not long-standing subsequent practice. A construction that is old is not necessarily contemporaneous, and a contemporaneous reading that fell into disuse may carry less weight than its original authority suggests.
Why It Matters in Research
Researchers encountering contemporanea in historical legal texts should be alert to several traps.
First, the term almost never appears alone in primary sources. It is an abbreviation of a longer maxim, and legal writers assumed reader familiarity. When a judge or treatise writer cites contemporanea without the full phrase, they are invoking the maxim, not a doctrine with independent standing.
Second, the weight given to this canon shifted considerably over time. In English common-law courts of the seventeenth and eighteenth centuries, contemporaneous construction — particularly the practice of early Parliaments or administrative officers — was treated as near-conclusive on questions of statutory meaning. By the nineteenth and twentieth centuries, courts in both England and the United States became more skeptical, treating contemporaneous practice as one factor among many rather than the strongest proof of meaning. American constitutional jurisprudence in particular has had a complicated relationship with the canon: originalist interpreters tend to revive its force, while textualists and purposivists may discount it if early practice seems politically motivated or simply mistaken.
Third, the corpus of sources citing contemporanea is heavily weighted toward commentary on Coke, particularly the Institutes. Researchers working backward from a nineteenth-century treatise citation will almost always find the chain leading to 2 Institutes 11. Understanding that lineage helps distinguish substantive doctrinal development from mere quotation of a venerable phrase.
Fourth, Anderson's dictionary redirects the reader to the entry for EXPOSITIO rather than defining contemporanea independently — a signal that nineteenth-century American legal lexicography treated the term as subordinate to the broader exposition doctrine. Burrill's fuller entry is the more useful starting point for historical research.
Historical Dictionary Support
Burrill's Law Dictionary provides the most substantive entry among the three sources, reproducing both the Latin maxim and its English translation and citing 2 Institutes 11 as authority — Coke's Institutes upon Littleton. The entry also begins to explain the mechanism: a statute is "best explained by following the construction put upon it" at the time of its enactment. This reflects the classical common-law understanding.
Rapalje & Lawrence and Anderson's Dictionary of Law offer minimal independent treatment. Anderson's redirects entirely to EXPOSITIO, confirming that by the late nineteenth century American practice the doctrine was understood as a subspecies of interpretive exposition rather than a freestanding rule.
None of the three sources engages critically with the canon's limitations or with the tension between contemporaneous construction and later-developing administrative practice. This gap is significant: historical dictionaries present contemporanea as settled and authoritative, but the actual case law, even in the period those dictionaries address, shows courts qualifying the maxim when early practice was sparse, self-interested, or inconsistent. Researchers should not take the dictionary formulations as evidence that courts applied the canon mechanically.
Jurisdictional Note
The canon has roots in English common law and was transplanted into American jurisprudence, but its force varies. Federal courts have applied it most prominently in constitutional interpretation and in construing early federal statutes where contemporaneous congressional or executive practice illuminates original meaning. State courts vary widely in how much weight they assign it.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Canons of Statutory Construction; Practical Construction; Originalism and Historical Interpretation.