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
An exclamation or oath, especially one that is profane, vulgar, or obscene.
a. 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.