Adverb (fukushi), Noun which may take the genitive case particle 'no'
one-by-one; separately; in detail
１つ１つの出願を１件ずつ考慮しなければならないだろう。We will have to consider each application on a case-by-case basis.
Also written １つ１つ【ひとつひとつ】、一つひとつ【ひとつひとつ】
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