(Internet slang, vulgar) Initialism of fuck it all.

(Britain) Initialism of Fellow of the Institute of Actuaries (professional qualification)

An arbitrary or authoritative command or order to do something; an effectual decree. / Authorization, permission or (official) sanction. / (English law) A warrant of a judge for certain processes.

(transitive, used in academic debate and role-playing games) To make (something) happen.

A man who is engaged to be married; the man to whom one is engaged. / A person engaged to be married.

A woman who is engaged to be married; the woman to whom one is engaged.

(chess) The development of a bishop by moving it one square to a long diagonal; specifically, a set of opening moves where a bishop is developed to the second rank of the adjacent knight file.

(chess) To play a fianchetto.

An automobile manufactured by the Italian firm Fiat S.p.A..

An Irish republican youth movement, founded by Constance Markievicz and Bulmer Hobson in 1909. / (Irish mythology) The Fianna.