piecemeal
piece-meal
adverb
In separate stages, gradually and bit by bit, rather than all at once.
"They completed the task piecemeal."
adjective
Done or made in separate stages, not all at once or systematically.
"The piecemeal approach caused delays."
Thesaurus
Synonyms: bit by bit, little by little, in stages, in small stages, stepwise, bit-by-bit, gradual, step-by-step