Definition
A Latin adverbial phrase meaning "forever" or "in perpetuity." Used in old English legal instruments and pleadings to indicate that a grant, right, prohibition, or obligation was intended to be permanent and without temporal limitation. The phrase functioned as a term of duration, signaling that whatever was conveyed or commanded was to endure indefinitely rather than for a fixed term or during a particular condition.
Why It Matters in Research
Researchers encountering this phrase in pre-modern English legal records — deeds, writs, pleadings, and entries on the plea rolls — should treat it as a durational qualifier attached to the operative language of the instrument. Its presence signals that the parties or the court intended permanent effect, which can bear directly on questions of whether a right was fee simple or conditional, whether an obligation survived successors, or whether a prohibition was intended to bind future parties.
The phrase appears in technical pleading contexts as well as conveyancing contexts. Burrill cites both Fleta (a late thirteenth-century treatise on English law) and Townsend's Pleadings, reflecting that the phrase had currency across both substantive and procedural registers of medieval and early modern practice. Researchers working in Year Books, Plea Rolls, or early Chancery records should expect to encounter it in both settings.
Because the phrase is Latin and appears in abbreviated or contracted form in manuscript sources, it is sometimes rendered in variant spellings (in perpetuum being the classical and more commonly normalized form). Researchers searching digitized corpora should run searches under both imperpetuum and in perpetuum, as scribal practice was inconsistent and corpus indexing may or may not normalize the two. The elided form imperpetuum is specifically the old English legal usage Burrill identifies; in perpetuum is the broader Latin form found across medieval European legal writing. For research purposes they are functionally synonymous, but the elided form is a marker of specifically English legal drafting tradition.
No modern statutory or common law counterpart uses this precise Latin phrase, but its functional equivalent — language of perpetual duration in fee simple grants or permanent injunctions — remains alive. When tracing the lineage of a perpetual easement, a fee simple grant, or a permanent injunction in historical records, imperpetuum in the source document is the ancestor of that modern concept.
Historical Dictionary Support
Burrill's entry is spare but accurate: "Forever. Fleta, lib. 2, c. 54, § 26. Towns. Pl. 19." The brevity reflects that the phrase presented no jurisprudential complexity — it was a workhorse of duration, not a contested legal concept. Burrill's decision to include it reflects the practical reality that attorneys and researchers working with old English legal texts needed to recognize Latin phrases on encounter, even when their meaning was straightforward.
The citation to Fleta grounds the phrase firmly in the late thirteenth century, when Latin pleading and drafting were standard. Fleta itself is a treatise heavily indebted to Bracton, written circa 1290, and its use of imperpetuum in book 2, chapter 54 situates the phrase in the context of serfdom and villeinage, specifically provisions relating to rights or conditions intended to bind without temporal limit. The citation to Townsend's Pleadings extends the phrase's documented use into formal pleading practice, confirming it was not limited to conveyancing.
No other historical dictionaries in the current Law Mind corpus cover this term. Researchers should note that Black's Law Dictionary carries the normalized form in perpetuum and treats it equivalently.
Jurisdictional Note
This is a term of historical English law with no active jurisdictional variation in modern practice. Its relevance is archival and interpretive — applicable wherever old English legal records are being read and understood.