Expletive (a.): Filling up; hence, added merely for the purpose of filling up; superfluous.
Expletive (n.): A word, letter, or syllable not necessary to the sense, but inserted to fill a vacancy; an oath.
Expletive (n): Profane or obscene expression usually of surprise or anger
Expletive (n): A word or phrase conveying no independent meaning but added to f