(military, aviation) Initialism of Forward Air Control. / Initialism of flow-accelerated corrosion. / Initialism of flow-assisted corrosion. / Initialism of Fellow of the Atlantic Council.

(typography, rare) A factotum letter, or a similar kind of ornamentally bordered letter formerly used at the start of a chapter or section of a book.

(colloquial) A faculty within a university.

plural of fac

plural of FAC

(slang) A child of a faculty member at a high school, university, or college.

Alternative spelling of facsimile

plural of fac-simile

plural of fac brat

(UK politics, historical) A rejected proposal to resolve the Irish border issue of Brexit by introducing technology and legislation that would streamline customs arrangements; ultimately the Northern Ireland Protocol was implemented instead.