adv. 25B6; adverb SLOWLY, slowly but surely, cautiously, gently, gingerly; piecemeal, little by little, bit by bit, inch by inch, by degrees; progressively, systematically; regularly, steadily.
GRADUALLY
Meaning of GRADUALLY in English
Concise Oxford thesaurus English vocabulary. Краткий оксфордский словарь английского языка тезаурус. 2012