Definition of volatile for English Language Learners. : 1  likely to change in a very sudden or extreme way. : 2  having or showing extreme or sudden changes of emotion. : 3  likely to become dangerous or out of control.
expletive (comparative more expletive, superlative most expletive) 1  Serving to fill up, merely for effect, otherwise redundant. 2  Marked by expletives (phrase-fillers).
exâ¢tincâ¢tion. 1. the act of extinguishing. 2. the state of being extinguished or extinct. 3. the act or process of becoming extinct: the extinction of a species. 4. the reduction or loss of a conditioned response as a result of the absence or withdrawal of reinforcement.