al ‧ le ‧ ga ‧ tion /ˌælɪˈɡeɪʃ ə n/ BrE AmE noun [countable usually plural]
a statement that someone has done something wrong or illegal, but that has not been proved
allegations of corruption/fraud/misconduct etc
Mr Singh has strongly denied the allegations of sexual harassment.
allegation that
an allegation that senior government figures were involved
allegation against
The teacher made serious allegations against a colleague.
allegation of
A committee will investigate allegations of racial discrimination.