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expletive

noun

  1. an oath or exclamation, esp. an obscenity
  2. a word, phrase, etc. not needed for the sense but used merely to fill out a sentence or metrical line, for grammar, rhythm, balance, etc.: there in “there is nothing left” is an expletive
  3. Rare anything serving as a filler

adjective

used to fill out a sentence, line, etc.
also expletory

See expletive in American Heritage Dictionary 4

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