Definition
A Latin law term meaning daily, every day, or from day to day. Found in old English legal records and pleadings, diatim functioned as a temporal modifier indicating that something occurred, was owed, or continued on a day-by-day basis. The term carried no substantive legal content of its own — it was a descriptor applied to obligations, entries, or proceedings to specify their daily character or recurrence.
Common Confusion
Diatim is occasionally confused with per diem, the more familiar Latin phrase meaning "by the day" that survives in modern legal and commercial usage. The two phrases are functionally equivalent in meaning but differ in provenance and context. Per diem appears in modern contracts, statutes, and court orders; diatim is confined almost entirely to older English records and historical legal instruments. A researcher encountering diatim in a source should not assume the document is using per diem as a synonym — the presence of diatim is itself a strong signal about the age and register of the source.
Why It Matters in Research
Structural pattern: straightforward single-meaning, archaic Latin descriptor.
Diatim surfaces almost exclusively in pre-modern English legal records — manorial accounts, ecclesiastical registers, plea rolls, and similar instruments from the medieval and early modern periods. Its appearance in a document is a useful dating and register signal: if diatim appears, the researcher is almost certainly working with a source predating the standardization of legal English, or with a later document that deliberately adopted archaic Latin formulation.
The practical research risk is misreading or skipping over diatim as meaningless filler. It is not. When diatim modifies an obligation or entry — for example, a daily payment, a recurring duty, or a running account — getting the temporal scope right matters for understanding the legal relationship the record describes. A duty owed diatim is structurally different from one owed annually or upon demand.
Researchers working in Law Mind's historical corpus should also note that diatim may appear in abbreviated or contracted form in manuscript sources, consistent with the common scribal practice of abbreviating frequently used Latin terms. The abbreviation may not be immediately legible without familiarity with medieval Latin contractions.
No modern statutory or regulatory usage of diatim is expected. If encountered in a post-nineteenth-century source outside of historical quotation, treat it as an affectation or error and verify the surrounding context carefully.
Historical Dictionary Support
The three source dictionaries — Black's Law Dictionary (both editions consulted) and Burrill's Law Dictionary — are in complete agreement. All three define diatim identically as "daily," "every day," or "from day to day," and all three attribute the usage to "old records," with each citing Spelman as the authority. This uniformity reflects the term's narrow, settled function: there was never meaningful dispute about what diatim meant, only about how often it would be encountered.
Burrill adds the useful gloss that diatim derives from dies (day), which confirms its classification as Law Latin — the hybrid Latin-English legal vocabulary that dominated English legal writing through the early modern period. This derivation is the entire semantic story: the word means nothing more and nothing less than its root suggests.
What the historical dictionaries do not provide is any contextual guidance on the types of instruments in which diatim characteristically appeared, the range of obligations it typically modified, or how it compared in practice to synonymous phrases. Researchers should not expect Black's or Burrill's to supply that interpretive layer — they document the term, not its habitat.
Jurisdictional Note
Diatim is a term of English legal history and does not appear as operative language in any modern jurisdiction's statutes, regulations, or court rules. It is relevant only in the historical research context, primarily for English common law materials.