Definition
Tempus semestre (Latin) is a term from old English law denoting a period of six months, specifically measured as one hundred and eighty-two days. The phrase translates literally as "half-year period" and was used in legal instruments, writs, and proceedings to designate a precise temporal interval of that duration. Unlike a looser reference to "six calendar months," tempus semestre carried a fixed day count, making it a term of art in contexts where exact computation of time was legally consequential.
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Why It Matters in Research
This term appears almost exclusively in older English legal materials — reports, writs, and procedural texts from the period when Latin remained the standard language of legal drafting. Researchers encountering it in primary sources from the sixteenth through eighteenth centuries should note the fixed day count: 182 days, not a variable calendar-month calculation. That distinction could affect the legal outcome whenever a right, limitation period, or procedural deadline was expressed in these terms, since calendar months do not uniformly yield 182 days.
The term surfaces in Year Book-era and early modern English case reports and in the Register of Writs (Registrum Judiciale), meaning it is most likely to appear in contexts involving limitations on actions, time-bound writs, or tenancy and land-related proceedings where half-year intervals were conventionally recognized. Researchers working in Law Mind's corpus of historical English law reports should treat tempus semestre as a signal to investigate how the surrounding document computes time — particularly whether the 182-day standard is being applied literally or whether the text treats it as functionally equivalent to six calendar months.
One research trap: post-medieval editors and translators sometimes silently rendered tempus semestre as "six months" without flagging the 182-day specificity. Readers relying on translated or abridged sources rather than original Latin texts may miss the precise calculation the original contemplated.
Because this is a term from old English law with no direct American successor doctrine, it will rarely appear in post-colonial American legal materials. Researchers in Anglo-American legal history or those tracing the roots of limitation periods and time computation rules will find it most relevant.
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Historical Dictionary Support
Burrill's Law Dictionary is the sole source among the standard historical legal dictionaries to define this term explicitly. Burrill's entry is compact but precise: it anchors the definition firmly in old English law, supplies the 182-day count, and cites four authorities — the Registrum Judiciale (Reg. Jud. 50 b), Coke's Reports (6 Co. 62 a), Yelverton's Reports (Yelv. 100), and Croke's Jacobean Reports (Cro. Jac. 166). These citations establish that the term had a recognized, consistent meaning across several generations of English legal reporting and was not idiosyncratic to a single source.
No comparable entry appears in Jacob's Law Dictionary, Tomlin's Law Dictionary, or Black's Law Dictionary in its earlier editions, reflecting the term's relatively narrow procedural usage and its obsolescence after Latin was phased out of English legal practice (formally abolished for most purposes in the early eighteenth century). The absence from American legal dictionaries is expected: tempus semestre was never naturalized into American law, and its substance — time computation — was absorbed into statutory frameworks using ordinary English terminology.
Burrill's treatment accurately conveys the functional purpose of the term without elaboration. Nothing in the entry is misleading, though researchers should be aware that Burrill wrote for practitioners who would have recognized the procedural register in which such terms operated. The citations he supplies are genuine early modern English reports and remain traceable in law library collections and digitized early English legal materials.
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Jurisdictional Note
Tempus semestre is a term of old English law with no recognized equivalent in American, Scottish, or civilian legal systems. It is not operative in any current jurisdiction. Its relevance is historical and confined to the interpretation of pre-modern English legal texts.
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