Jisho

×
Adverb (fukushi), Noun which may take the genitive case particle 'no'
1. one by one; one each; one at a timeSee also ずつ
Other forms
一つ宛 【ひとつずつ】一つづつ 【ひとつづつ】一つ宛 【ひとつづつ】
Notes
一つ宛: Rarely-used kanji form. 一つ宛: Rarely-used kanji form.

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