The meaning of HAPPY is favored by luck or fortune : fortunate. How to use happy in a sentence. Synonym Discussion of Happy . Some common synonyms of happy are fortunate, lucky, and providential. While all these words mean "meeting with unforeseen success," happy combines the implications of lucky and fortunate with stress on being blessed. HAPPY meaning: 1 : feeling pleasure and enjoyment because of your life, situation, etc.; 2 : showing or causing feelings of pleasure and enjoyment Definition of happy adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.