<p><strong>Noun</strong></p><ul><li>an interjectory word or expression, frequently profane; an exclamatory oath.</li><li>a syllable, word, or phrase serving to fill out.</li><li>Grammar: a word considered as regularly filling the syntactic position of another, as it in <em>It is his duty to go</em>, or there in <em>There is nothing here</em>.</li></ul><p><strong>Adjective</strong></p><ul><li>Also ex·ple·to·ry: added merely to fill out a sentence or line, give emphasis, etc.: Expletive remarks padded the speech.</li></ul>