Pronunciation (UK) (US) enPR: ăl'ĭ-gā'shən, IPA (key): /ˌæl.ɪˈɡeɪ.ʃən/ or /ˌæl.əˈɡeɪ.ʃən/ Audio (US)(file) Noun Singular allegation Plural allegations (countable) An allegation is a claim or a statement that is not proven and may or may not be true. Synonym: accusation The statement that our neighbor is a serial killer right now is an unconfirmed allegation. They were arrested on allegations of trying to tamper with the evidence.Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads