1. An exclamation or oath, especially one that is profane, vulgar, or obscene. 2a. A word or phrase that does not contribute any meaning but is added only to fill out a sentence or a metrical line. b.Linguistics A word or other grammatical element that has no meaning but is needed to fill a syntactic position, such as the words it and there in the sentences It's raining and There are many books on the table.
ADJECTIVE:
Added or inserted in order to fill out something, such as a sentence or a metrical line.
ETYMOLOGY:
From Late Latin expltvus, serving to fill out, from Latin expltus, past participle of explre, to fill out : ex-, ex- + plre, to fill; see pel-1 in Appendix I.