Ancien.
ETYM Latin veteranus (sc. miles): cf. French vétéran.
1. A person who has served in the armed forces; SYN. vet, ex-serviceman.
2. A serviceman who has seen considerable active service; SYN. veteran soldier.
3. An experienced person; someone who has given long service; SYN. old-timer, old hand, warhorse, old stager.