Definition
A Latin term meaning "so much" or "so great," used in old English legal instruments and pleadings to denote a quantity or amount corresponding to some standard previously stated or understood. In practice, tantus functioned as a referential quantifier — a shorthand that pointed back to a measure already established in the document rather than restating it. The phrase tantam terram cum pertinentiis, meaning "so much land with the appurtenances," is the primary surviving example in English legal usage, appearing in conveyancing and pleading contexts to describe a parcel of land by reference to a quantity already identified.
Common Language
Modern common usage (Wiktionary): No English entry. The word is not in active common English use.
Historical common usage (Webster's 1913): Not listed. Tantus was never naturalized into English as an ordinary word.
The term belongs entirely to legal Latin. Because it carries no common English meaning, no gap between legal and ordinary usage exists — the word is simply foreign to non-legal contexts. The COMMON LANGUAGE section is therefore inapplicable.
Why It Matters in Research
Researchers working with medieval and early modern English legal manuscripts, plea rolls, or conveyancing instruments will encounter tantus as a linking quantifier. Its function is syntactic as much as substantive: the word itself does not state a measure but directs the reader to a measure stated elsewhere in the same document or writ. Failure to recognize this referential character can cause a researcher to treat the term as a gap or omission when it is actually an internal cross-reference.
The phrase tantam terram cum pertinentiis is the form most likely to appear in practice. Fleta, the late thirteenth-century treatise on English law cited in Burrill, is the anchor source for this usage, and researchers tracing the phrase should consult that work directly rather than relying on later digest summaries.
Because tantus appears almost exclusively in highly formulaic contexts — writs, pleadings, and conveyances following fixed patterns — its presence is a useful signal that the document adheres to an established form. Deviations from that form, or documents that use tantus without a corresponding antecedent quantity, may indicate scribal error, later interpolation, or an abbreviated copy.
Jurisdictional variation is not a meaningful concern here. The term belongs to the Latin layer of old English law and does not have parallel development in civil law or continental traditions that would affect its meaning in English sources.
Historical Dictionary Support
Burrill's Law Dictionary provides the sole historical dictionary entry of substance. Burrill defines tantus as "so much" and situates it in old English law, citing Fleta, lib. 3, c. 14, § 5. The entry is brief, as befits a term whose legal work is almost entirely carried by a single stock phrase. No competing definition appears in the other standard historical dictionaries of English law, which either omit the term or subsume it under general discussions of Latin legal vocabulary.
The classical Latin dictionaries confirm the core meaning: tantus (also tantus, a, um) denotes "of such size or measure, so great" in amount, extent, or value, typically correlating with a following quantus ("as great as") or ut clause. In English legal usage, the correlative structure was often compressed — the quantus antecedent was supplied by the surrounding instrument rather than by grammatical construction within the phrase itself. This compression is worth noting because it means classical Latin parsing alone will not fully account for how the word functions in a legal document.
Burrill's citation to Fleta is reliable and provides a firm textual anchor. Researchers who need to verify the usage in context should go to Fleta directly rather than treating Burrill's brief gloss as exhaustive.