Definition
A Latin adverb used in legal writing and citation. IBI carries three related but distinct senses in classical and legal Latin:
1. There; in that place. Used as the correlative of ubi (where), IBI specifies location — the place in which something occurred, was done, or is to be performed.
2. Therein; in that thing. A narrower sense pointing inward to a specific document, provision, or subject matter already identified.
3. Then; at that time. A temporal sense, less common in legal usage but present in classical Latin sources.
In legal citation practice, IBI appears primarily as an abbreviation for ibidem (in the same place), used to refer back to a source just cited without repeating its full citation. In this function it is interchangeable with ibid. Anderson's cross-reference to IBIDEM confirms this citation use as the entry point most researchers will encounter.
Common Language
Wiktionary identifies IBI as an initialism for three modern technical terms: index of biological integrity (environmental science), inquiry-based instruction (education), and interbeat interval (cardiology/physiology). None of these meanings have any connection to the legal term. A researcher encountering IBI in a legal text should not import any of these modern technical meanings into the legal context.
Common Confusion
IBI is frequently encountered as a short form of ibidem and treated as synonymous with ibid. The two are functionally identical in citation use. Confusion arises when IBI appears in older legal texts in its substantive Latin senses — there, therein, then — rather than as a citation abbreviation. Readers accustomed to seeing IBI only as a citation signal may misread substantive Latin passages. The Burrill entry makes clear that IBI as a standalone Latin adverb had independent doctrinal significance, as illustrated by the maxim on venue.
Why It Matters in Research
The primary research value of this entry is disambiguation. In the Law Mind corpus, IBI will appear in at least two distinct functions: (1) as a citation abbreviation equivalent to ibid., directing the reader to the same source previously cited; and (2) as a substantive Latin term in maxims, particularly in rules about venue, jurisdiction, and the location of legal acts.
The venue maxim preserved in Burrill — Ibi semper debet fieri triatio ubi juratores meliorem possunt habere notitiam (A trial ought always to be had where the jurors can have the best information) — is a historically significant principle traceable to Coke and appears in early common law discussions of venue and local knowledge. Researchers working on historical venue doctrine, jury selection, or the development of the vicinage requirement will encounter this maxim and need to recognize IBI as the operative locative term.
Anderson's abbreviated entry adds little beyond directing researchers to RATIO and IDEM, signaling that IBI's chief dictionary function is as a cross-reference anchor rather than an independently defined term.
Trap for the unwary: In heavily Latinized legal texts, IBI may appear mid-sentence as a pronoun-like locative without translation. Reading it as ibid. (a citation back-reference) in such a context will produce nonsense. Context — specifically, whether IBI appears within a citation string or within flowing Latin prose — is the key to correct interpretation.
Historical Dictionary Support
Burrill provides the substantive treatment, drawing on Calvinus's Lexicon Juridicum for both the spatial (there; in that place) and the internal (therein; in that thing) senses. The citation to Bulwer's Case (7 Co. 1b) anchors the venue maxim in Coke's Reports, a credible early-seventeenth-century source. Anderson, by contrast, treats IBI as purely a cross-reference term with no independent definition, reflecting the later nineteenth-century American tendency to fold Latin citation abbreviations into idem/ibidem entries rather than treat IBI on its own terms. Neither dictionary addresses the modern initialism senses, which are entirely post-date and irrelevant to legal usage.
Jurisdictional Note
IBI as a Latin adverb and citation abbreviation appears across all common law jurisdictions without meaningful jurisdictional variation. The venue maxim cited by Burrill reflects a general common law principle absorbed into both English and American procedure, though its specific doctrinal applications vary by jurisdiction.