n a fellow, comrade, colleague, partner or someone with whom something is shared, e.g. shipmate, classmate
n (context|colloquial|British|Australia|New Zealand) a colloquial "sir"; an informal and friendly term of address to a stranger, usually male
n (nautical) In naval ranks, a non-commissioned officer or his subordinate (e.g. (w|Boatswain's Mate), (w|Gunner's Mate), Sailmaker's Mate, etc).
n A technical assistant in certain trades (e.g. gasfitter's mate, plumber's mate); sometimes an apprentice.
n (nonstandard spelling of|maté|nodot=1), an aromatic tea-like drink prepared from the holly yerba maté (Ilex paraguariensis).