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expletive // ĕk′splĭ-tĭv // noun
An exclamation or oath, especially one that is profane, vulgar, or obscene.
A word or phrase that does not contribute any meaning but is added only to fill out a sentence or a metrical line.
(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.