MOSTLY Meaning of MOSTLY in English /mohst"lee/ , adv.1. for the most part; in the main: The work is mostly done.2. chiefly; principally. 3. generally; customarily. [ 1585-95; MOST + -LY ] Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012