From Longman Dictionary of Contemporary Englishlead timelead time /ˈliːd taɪm/ noun [uncountable] the time that it takes to make or produce somethingFrom Longman Business Dictionarylead timeˈlead time [countable]COMMERCE the time it takes to prepare, make, or deliver somethingIt takes long lead times to propose and build new nuclear power plants. → time