Definition
Latin phrase meaning "from day to day." Used in legal instruments, pleadings, and judicial opinions to indicate that something accrues, continues, runs, or is computed on a day-by-day basis. Most commonly encountered in the context of interest accrual, rent obligations, continuing trespass, damages, and the running of statutory periods where a daily increment or ongoing continuance is legally significant.
The phrase functions as a temporal modifier rather than a standalone legal doctrine. It signals that liability, entitlement, or obligation does not arise as a lump sum at a fixed point but accumulates or persists through each successive day.
Why It Matters in Research
This is a structural pattern term — straightforward single-meaning Latin maxim — but researchers encounter it in a surprisingly wide range of doctrinal contexts, which can obscure its function.
First, context governs meaning. When de die in diem appears in a case about rent, it describes continuing accrual of a periodic obligation. When it appears in a trespass or nuisance case, it signals a continuing wrong that renews the cause of action each day. When it appears in an interest or damages calculation, it describes the arithmetic basis of recovery. A researcher who treats the phrase as having a fixed doctrinal home will miss its cross-contextual role.
Second, historical sources use it sparingly as a citation anchor. Bracton's folio 205b is the recurring reference in all major historical dictionaries. Researchers following that thread into Bracton are entering medieval common law territory where the phrase appeared in discussions of seisin and possession — quite different from the commercial and damages contexts where the phrase most often appears in nineteenth- and twentieth-century American reports. Do not assume Bracton's usage maps cleanly onto later Anglo-American applications.
Third, the phrase tends to appear in older reported decisions without explanation, as courts assumed reader familiarity with legal Latin. In corpus searches, it may appear in italicized or roman type, with or without hyphenation (de die in diem, de-die-in-diem), and occasionally abbreviated or paraphrased as "from day to day" in the same document. Search strategies should account for all variants.
Fourth, for researchers working on interest and damages questions, de die in diem is a useful signal that a court is engaging with per diem accrual methodology. Connecting this phrase to related discussions of per diem, interest ex mora, and continuing tort doctrine will typically yield the surrounding analytical framework the phrase itself does not provide.
Historical Dictionary Support
The three historical sources are in substantial agreement and collectively brief. Black's (1st and 2nd editions) and Burrill's all define the phrase identically as "from day to day" and anchor the reference to Bracton. Burrill adds a secondary citation to 6 Modern Reports 252, attributed to Chief Justice Holt, which places the phrase in early eighteenth-century English case law — a useful pointer for researchers tracing the phrase into the common law reports. Neither Black's edition provides that secondary citation, making Burrill the more useful source for tracking the phrase beyond Bracton.
None of the historical dictionaries explain the doctrinal contexts in which the phrase operates, which is characteristic of the era's treatment of Latin maxims: translate, cite the classical source, move on. The modern researcher should not expect these entries to illuminate application; they confirm meaning and provide the primary citation trail.
The folio citation varies slightly across editions (205b in Burrill and Black's 1st; 2050 in Black's 2nd), likely reflecting a typographic variation in the printed editions rather than a substantive discrepancy.