expletive
noun
an interjectory word or expression, frequently profane; an exclamatory oath.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
And, where a dance is expletively introduced in the intervals of the acts, the subject of it should have, at least, some affinity to the piece.
From A Treatise on the Art of Dancing by Giovanni-Andrea Gallini