The meaning of CHEF is a skilled professional cook ; specifically : one who is in charge of a professional kitchen. How to use chef in a sentence. There is a wide array of differences between a chef and a cook, and we’re taking the time to explain those differences in this article. Definition of chef noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Learn the English definition and meaning of Chef with examples, pronunciation, and translations to enhance your vocabulary.