Definition
An obsolete English legal term denoting the court of the justices itinerant, also called justices in eyre. The eyre was a judicial circuit through the counties of medieval England, conducted by royal judges (justices in eyre) commissioned by the Crown to travel (iter) through the realm, hearing pleas of the Crown, conducting general inquiries into local administration, and dispensing royal justice. The term appears in variant spellings — eyre, eire, eier, eyer, eyr — across historical sources and should be treated as interchangeable in legal research contexts.
Common Language
Modern common usage (Wiktionary): An obsolete spelling of "air."
Historical common usage (Webster's 1913): "Air. [Obs.]" — cited to Chaucer.
The word in ordinary historical English was simply an archaic spelling of "air." The legal term has an entirely different origin and meaning, deriving from the Latin iter (a journey or road), not from any word for atmosphere. A researcher encountering "eyr" or "eyre" in a medieval legal record is reading a technical term of English judicial administration, not a variant spelling of a common noun.
Why It Matters in Research
This term is primarily encountered in sources dealing with early English legal history, roughly from the twelfth through fourteenth centuries. The eyre system was the dominant mechanism of royal justice before the Common Pleas and King's Bench hardened into fixed central courts. Researchers working in Bracton, Britton, or early Reeves will encounter it frequently.
Spelling instability is the primary research trap. The term appears as eyr, eyre, eire, eier, eyer, and in Scots sources as ayre, ayr, or aire. Full-text searches that fix on a single spelling will miss significant material. Any corpus search strategy must account for all variants.
The Scots form (ayre, aire) is particularly important: it persisted longer in Scottish legal usage and refers to analogous circuit court arrangements in Scotland. Do not assume the English eyre sources govern Scottish ayre records, or vice versa.
The eyre system effectively collapsed after the fourteenth century, replaced by commissions of assize and nisi prius. By the time Blackstone writes, the eyre is historical antiquity. Sources post-dating roughly 1400 that invoke "eyre" are almost always referring back to earlier law, not describing a live institution.
Corpus connections: Researchers pursuing the history of itinerant justice, the development of common law pleading, or the origins of English county administration will need to move from eyre sources into the related literature on assizes, commissions of oyer and terminer, and gaol delivery, which absorbed the eyre's functions.
Historical Dictionary Support
Burrill is the primary source here, and his entry is characteristically compressed but accurate. He correctly identifies the Old French and Latin roots, flags the Scots variants, and provides the key primary reference points: Britton (c. 2), Coke on Littleton (293), Gilbert's Common Pleas, Reeves's History of English Law, and Spelman's Glossary (sub Iter). These remain the foundational secondary sources for the institution.
What Burrill does not do — and historical dictionaries generally do not — is explain the institutional significance of the eyre or its relationship to the later assize system. For that, Reeves and Pollock and Maitland's History of English Law are the standard references. Spelman's cross-reference to Iter is genuinely useful: researchers who hit a wall under "eyre" variants should search Spelman and other Latinate sources under iter, as the Latin form appears in documentary records more often than the French vernacular form in certain periods.
Webster's 1913 effectively ignores the legal meaning, treating the word purely as a variant spelling of "air." This reflects how thoroughly the legal institution had passed from living memory by the nineteenth century. A researcher relying solely on general dictionaries of the period would be entirely misled.
Jurisdictional Note
The eyre was a specifically English institution. Scotland had a related but distinct circuit system (the ayre or justice ayre), and the two should not be conflated in research. No direct American legal analogue exists; the institution did not transplant to the colonies.