Meaning of OPTIMAL in English

OPTIMAL

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.