max Syllabification: (max)Pronunciation: /maks/Definition of max abbreviation maximum. noun informal a maximum amount or setting:the sound is distorted to the max adverb informal at the most:our information can be in the commander’s hand in half an hour, max verb informal reach or cause to reach the limit of capacity or ability:job growth in high technology will max outmax in other Oxford dictionaries Definition of max in the British & World English dictionary