a person who is exempt from an obligation, duty, etc.
4.
(in Britain) exon.
Origin: 1325–75; (adj.) Middle English < Old French < Latin exemptus, past participle of eximere to take out, free, release, equivalent to ex-ex-1 + emptus (past participle of emere to buy, obtain); (v.) late Middle English exempten < Old French exempter, derivative of exempt