Liberal Dictionary English Dictionary
adjective
- never surpassed or greater: Production will reach an all-time high.
- regarded as such in its entire history: an all-time favorite song.
adjective
- (prenominal) informal unsurpassed in some respect at a particular timean all-time record at the Olympics
“during recorded time,” 1910, American English, from all + time (n.). Earlier it had been used in a sense “full-time,” of employment, or in opposition to one-time (1883).