Definition of already adverb in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. 2 meanings: 1. by or before a stated or implied time 2. at a time earlier than expected.... Click for more definitions. The meaning of ALREADY is prior to a specified or implied past, present, or future time : by this time : previously. How to use already in a sentence. When something is finished before another, expected time, use the adverb " already ." You can also use " already " when something happens much faster that you think is possible.