all-time \ˈ ̷ ̷ˌ ̷ ̷\adjective 1.: full-time 2. a.: for or of all time up to and including the present < an all-time average > especially: exceeding all others of all time < an all-time record > < receipts are expected to reach an all-time high > b.: the best, or hypothetically the best, in recorded sports history < an all-time baseball team >