OPTIMAL Meaning of OPTIMAL in English op ‧ ti ‧ mal /ˈɒptəm ə l, ˈɒptɪm ə l $ ˈɑːp-/ BrE AmE adjective formal the best or most suitable SYN optimum Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012