From Longman Dictionary of Contemporary EnglishRelated topics: Lawconsenting adultconˌsenting ˈadult noun [countable] lawSCLsomeone who is considered to be old enough to decide whether they want to have sex →age of consentExamples from the Corpusconsenting adult• I mean he is a consenting adult.• You may be currently living with a consenting adult you have realaffection for.