Synonyms for Piecemeal (same or very similar meaning)
WordNet sense 1 (one thing at a time):
step-by-step, bit-by-bit, stepwise, in small stagesWordNet sense 2 (proceeding in small stages):
gradualWordNet sense 3 (a little bit at a time):
little by little, in stagesFrom the ODE community, based on WordNetadd/edit