постепенно

1) General subject: a bit at a time, alki, bit by bit, by and by, by degrees, by degress, by easy stages, by inches, by little and little, by little and little, by piecemeal, gradually, inchmeal, little by little, phase in, phase out, piece by piece, piecemeal, step by step, stepwise, softly, over time

2) Naval: steady

3) Colloquial: one day at a time

4) Latin: gradatim

5) Mathematics: by degree, in a gradual manner, smoothly

6) Religion: gradatim (Latin for "gradually", step by step)

7) Economy: by step

8) Music: poco a poco, poco poco

9) Oil: step-by-step

10) Mechanic engineering: by stages

11) Advertising: by progressive stages

12) Programming: in stages

13) Makarov: at length, bit at time, bit bay bit, by bit, by inches, by inchmeal, by little, degree, in sequence, inch by inch, progressively, slow, do in a piecemeal manner

14) Ebay. successively