1. (adverb) one by one, one after another, one at a time
in single file
Synonyms: one at a time, by the piece, on an individual basis, individually, one after another, separately, singly, severally, one by one
2. (adverb) by the piece, one by one
one piece at a time
Synonyms: one at a time, by the piece, on an individual basis, individually, one after another, separately, singly, severally, one by one
3. (adverb) individually, separately, singly, severally, one by one, on an individual basis
apart from others
Synonyms: independently, by the piece, one after another, one by one, individually, respectively, separately, singly, severally, one at a time, on an individual basis
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Synonyms for one by one 
