Learn the meaning of constraint as a noun, with examples of how to use it in sentences. Constraint can mean something that limits or restricts someone or something, or control that limits or restricts someone's actions or behavior. Synonyms for CONSTRAINT : restraint, discipline, repression, inhibition, suppression, composure, discretion, self-control; Antonyms of CONSTRAINT : incontinence ... Learn the meaning, pronunciation and usage of the word constraint, which means a thing that limits something or your freedom to do something. See synonyms, collocations and example sentences from the Oxford Advanced Learner's Dictionary. A constraint is a limit or restriction. Hopefully your school won't cut the sports or music programs due to budget constraints !