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).
â¢ EX (noun) The noun EX has 3 senses: 1. a man who was formerly a certain woman's husband. 2. a woman who was formerly a particular man's wife. 3. the 24th letter of the Roman alphabet. Familiarity information: EX used as a noun is uncommon.