Origin: Latin suffix -tion
Allegation has 3 different meanings across 1 category:
(law) a formal accusation against somebody (often in a court of law)
"an allegation of malpractice"
statements affirming or denying certain matters of fact that you are prepared to prove
"The lawyer dismissed the allegation as baseless since no evidence was presented to prove the claim against her client."
An assertion, especially an accusation, not necessarily based on facts.
"The police are investigating the allegation that he stole money from the charity fund."