Definition of RESTRAINT in the Definitions.net dictionary. Meaning of RESTRAINT . What does RESTRAINT mean ? Information and translations of RESTRAINT in the most comprehensive dictionary definitions resource on the web. Restraint is the act of holding something back. For example, if you exercise restraint over your emotions, you won't burst out into tears in public. Restraint is the act or state of limiting or controlling something or someone. It can also mean a device or means of restraining, or a lack of freedom or expression. See different sources and translations of the word restraint . Definition of restraint noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.