Definition
IBM, in legal citation practice, is an abbreviation for *ibidem* — a Latin term meaning "in the same place." When appearing in a legal text, footnote, or case report, IBM signals that the cited authority is the same source, volume, or page referenced immediately before. The abbreviation functions identically to *ibid.*, which is the form more commonly encountered in modern legal writing.
This use is strictly a citation convention, not a substantive legal term. It carries no doctrinal weight of its own.
Common Language
Modern common usage (Wiktionary): IBM is widely recognized as the initialism for International Business Machines, the multinational technology corporation. Secondary uses include International Brotherhood of Magicians and Izu-Bonin-Mariana Arc (a geological formation).
Historical common usage: The abbreviation does not appear in Webster's 1913 in either its legal or common corporate sense; the technology company was not founded until 1911 and had not yet acquired that name.
The gap here is stark: a researcher encountering IBM in a nineteenth-century legal text or footnote should not read it as a reference to any corporation or organization. In that context, IBM is a purely bibliographic marker pointing back to a previously cited source, with no connection to any of the term's modern popular meanings.
Common Confusion
IBM and *ibid.* are interchangeable in function, but IBM is the older and rarer contracted form. Researchers working with historical legal manuscripts, early American practice manuals, or English common law texts may encounter IBM where a modern text would use *ibid.* or *id.* Do not confuse IBM with *id.*, which in legal citation refers to the same authority but may signal a different page; *ibidem* (and therefore IBM) classically means the same place exactly, with no variation of page or section.
Why It Matters in Research
Researchers working in historical legal sources — particularly early English and American practice books, clerk's manuals, and annotated statutes — will occasionally encounter IBM in footnotes or marginal citations. Its rarity means it can be misread or overlooked entirely, especially in digitized texts where OCR may render it inconsistently.
The key navigational point: when you see IBM in a pre-twentieth-century legal text, trace it backward to the immediately preceding citation. Do not treat it as a reference to a party name, institution, or organization. In corpus searching, a raw keyword search for IBM in historical legal materials will almost certainly return false positives drawn from the term's modern corporate identity; researchers should filter results by date and context.
Burrill's cross-reference to *1 Inst. Cler. 10* anchors this usage in the tradition of clerks' practice manuals, suggesting IBM appears in procedural and drafting contexts more than in judicial opinions.
Historical Dictionary Support
Burrill's Law Dictionary provides the only historical legal dictionary entry identified for this term, and it is appropriately brief: IBM is defined simply as a contraction of *ibidem*, with a citation to *1 Inst. Cler. 10* as the authority for that usage. Burrill adds nothing further, which itself signals that this was a well-understood clerical shorthand requiring no elaboration for the practicing lawyer of the period.
No other historical legal dictionaries in the Law Mind corpus appear to carry a standalone entry for IBM, likely because the abbreviation was so conventional as to need no definition except in a work expressly cataloging citation shorthand. The absence of entries in sources like Black's or Bouvier's is unremarkable.
Jurisdictional Note
This term has no jurisdictional variation in its legal citation sense. The abbreviation was used in English and American legal writing interchangeably and reflects a shared Latin citation tradition rather than any particular court's rules.