Definition
Mod. (also written mod.) is a Latin abbreviation appearing in older legal texts and manuscript sources, short for modus — meaning "manner," "mode," or "way." In legal contexts, it signals a qualifying condition or the particular manner in which something is held, granted, or executed. The term most frequently surfaces in discussions of tenure, property, and the construction of wills, where the specific mode of holding determines the nature and extent of the interest conveyed.
Common Language
Modern common usage (Wiktionary): Abbreviation of "moderate."
Historical common usage (Webster's 1913): Not separately defined as a standalone term; treated as a shortening of "mode" or "moderate."
The gap here is complete. In everyday English, "mod" suggests either moderation or a mid-twentieth-century style subculture. In historical legal manuscripts and printed reports, it is purely a Latin abbreviatory mark standing in for modus — a term of art with specific doctrinal weight in property law and conflict of laws. A researcher encountering "mod." in a legal text should not associate it with either modern sense.
Common Confusion
Mod. (for modus) should not be confused with mod. in medical or scientific usage (meaning "moderate" or "modification"), nor with the musical or software term "mod." In browsing digitized legal collections, OCR errors frequently mangle the abbreviation into "mod," "mod," or run it together with surrounding text, causing search failures. Researchers should also distinguish modus from the related but distinct terms modus operandi (manner of operating) and modus vivendi (temporary arrangement), neither of which carries the same property-law freight.
Why It Matters in Research
The practical importance of mod. in legal research is almost entirely historical and manuscript-navigational. The term does not appear in modern statutory or case law as a standalone abbreviation; its domain is Bracton-era and early modern property doctrine, conflict of laws treatises, and annotated editions of the civil law.
Two research traps arise. First, in digitized sources — particularly Law Mind corpus texts from the seventeenth through nineteenth centuries — "mod." appears mid-sentence as a space-saving device, and full-text search for the string "mod" will surface hundreds of irrelevant hits. Narrowing to "mod." with a trailing period, or searching for the spelled-out modus, will produce cleaner results.
Second, the Burrill passage excerpted in the source material links mod. to a cluster of substantive legal questions: how property is held (for years, for life, or in fee), by how many (one or several), and in what sequence (simultaneously or successively). These are not minor procedural details — they determine the entire architecture of a property interest. When Bracton uses modus in this sense, he is asking whether the mode of holding qualifies or limits an otherwise absolute grant. Researchers working on medieval or early modern tenure questions will find that tracking the use of mod./modus across Bracton's De Legibus, the Year Books, and early equity materials reveals how courts used "manner of holding" as a tool for resolving ambiguity in grants and devises.
The Burrill passage also ties mod. to conflict of laws — specifically, to the principle that wills of personal property executed according to the law of the testator's domicil will pass movables in other jurisdictions. The mode of execution (modus) matters for validity; the mode of holding matters for construction. Researchers moving between these two uses should be careful not to conflate them.
Historical Dictionary Support
Burrill's Law Dictionary is the primary English-language legal dictionary source that uses mod. as a headword in the relevant sense, though Burrill treats it more as a manuscript marker than a freestanding legal concept. The excerpt Burrill provides is dense and allusive, citing Bracton (fol. 17), Huber's De Conflictu Legum, and unspecified Praelectiones — characteristic of Burrill's method of accumulating authority rather than synthesizing it.
What Burrill does not provide is a clear analytical definition separating the property-law sense of modus from its conflict-of-laws sense. Later dictionaries — including Black's Law Dictionary in its various editions — break modus out as a full entry, distinguishing modus et conventio vincunt legem (manner and agreement override law) and modus tenendi (manner of holding). Burrill's treatment is narrower and more archival. For researchers working in the Law Mind corpus, Burrill's entry is most useful as a pointer to primary sources rather than as a doctrinal guide.
Jurisdictional Note
Modus/mod. as a property-law term of art is essentially confined to English common law and its derivatives. Civil law jurisdictions use modus in a partially overlapping but not identical sense (particularly in obligations and testamentary law), so researchers crossing between common law and civil law sources should not assume terminological equivalence.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: TENURE (for the property-holding dimensions of modus); DOMICIL (for the conflict-of-laws dimension reflected in the Burrill passage).