Etymology

cos.

Today it means: Consul in the year —. (Used, similarly to fl., in dating Roman texts composed by authors whose year of consulship is known, but little else for dating purposes.) Full definition →

Latin cōs.
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The story

  1. Latin · borrowed fromcōs.
  2. Latin · borrowed fromcōs.
  3. English todaycos.

Borrowed from Latin cōs., abbreviation of cōnsul (“consul”).

Etymology from Wiktionary, CC BY-SA 4.0.