Synonyms of bit by bit

Adjective

1. bit-by-bit, in small stages, piecemeal, step-by-step, stepwise, gradual (vs. sudden)

usage: one thing at a time

Adverb

1. piecemeal, little by little, bit by bit, in stages

usage: a little bit at a time; "the research structure has developed piecemeal"

2. gradually, bit by bit, step by step

usage: in a gradual manner; "the snake moved gradually toward its victim"