Definition
A Latin phrase meaning "within a year" or "under a year." Used in legal contexts to describe an act, obligation, period, or legal consequence that must occur, is measured by, or is limited to a span of less than one year. The phrase functions as a temporal qualifier, typically modifying a legal rule or right that turns on whether something has or has not elapsed within the annual period.
Why It Matters in Research
Infra annum appears most often in older common law materials — medieval and early modern treatises, writs, and pleadings — where the one-year boundary carried substantive legal weight. The phrase is associated in the historical sources with Bracton (De Legibus et Consuetudinibus Angliae, fol. 7), the thirteenth-century treatise that remains a foundational primary source for early English common law. Researchers working with Bracton or with materials drawn from it will encounter infra annum as a shorthand for legal periods governing rights of entry, administration of estates, claims by widows, and warranty obligations, among others.
The chief research trap is that infra annum is not a standalone doctrine — it is a modifier. Its meaning is only fully recoverable by identifying the specific rule it qualifies. The same phrase could describe the period within which a widow must make her election, within which an heir must enter after the ancestor's death, or within which an administrator must act. Researchers who encounter the term must trace it to its governing context before drawing conclusions about the operative legal rule.
Because the phrase drops out of active legal use well before the modern period, it will not appear in contemporary statutes, regulations, or case law except in historical quotation. Corpus searches should be directed primarily at treatise literature, Year Books, early English reports, and colonial American legal materials that drew on the English common law tradition. The term is absent from most modern legal writing, so its appearance in a document is itself a strong signal of antiquity or deliberate archaism.
No meaningful jurisdictional variation exists in how the phrase itself is used; variation lies in the underlying substantive rules it describes, which differed across historical common law contexts.
Historical Dictionary Support
All three source dictionaries agree on the core translation: "under or within a year." All three cite Bracton, fol. 7 as the sole or primary authority, which signals that the phrase's legal pedigree runs directly to the medieval English treatise tradition and that the compilers found no need to update or expand the definition beyond that foundational reference.
Burrill's Law Dictionary adds the notation "L. Lat." — Law Latin — making explicit what Black's leaves implicit: this is a term of art from the Latin legal vocabulary of the common law, not classical or ecclesiastical Latin. This distinction matters for researchers, because Law Latin terms often have technical meanings that diverged from their classical counterparts and that are best interpreted through common law sources rather than Latin dictionaries.
What the historical dictionaries do not provide is any substantive account of the legal rules in which infra annum operated. The entries are definitional placeholders, adequate for translating the phrase but insufficient for understanding its function in a specific doctrinal context. Researchers needing more than a translation must go to Bracton directly or to secondary scholarship on early English common law, such as Pollock and Maitland's The History of English Law Before the Time of Edward I.