1. (adj)timely, seasonable, well-timed(a), well timed(p) done or happening at the appropriate or proper time "a timely warning"; "with timely treatment the patient has a good chance of recovery"; "a seasonable time for discussion"; "the book's publication was well timed"
2. (adverb)seasonably, timely, well-timed, apropos at an opportune time "your letter arrived apropos"