ADULTERER Meaning of ADULTERER in English a ‧ dul ‧ ter ‧ er /əˈdʌlt ə rə $ -ər/ BrE AmE noun [countable] someone who is married and has sex with someone who is not their wife or husband Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012