一ひとつ一ひとつ

ひ

と

つ

ひ

と

つ

Common wordFreq.FrequencyTop 50,000

Meanings

adverb, noun which may take the genitive case particle 'no'

Used for doing something to each item individually, or for examining things carefully one at a time. Can function adverbially or as a no-adjective.

〈物もの〉を一ひとつ一ひとつ確かく認にんするto check each item one by one
荷に物もつの中なか身みを一ひとつ一ひとつ確かく認にんした。
I checked the contents of the luggage one by one.
一ひとつ一ひとつ丁てい寧ねいに〈動どう詞し〉to do something carefully, one item at a time
先せん生せいは一ひとつ一ひとつ丁てい寧ねいに説せつ明めいしてくれた。
The teacher explained each point carefully, one by one.
一ひとつ一ひとつの〈物もの〉が違ちがうeach individual item is different
手て作づくりの器うつわは一ひとつ一ひとつの形かたちが違ちがう。
Each handmade bowl has a slightly different shape.

それぞれN3
それぞれ means 'each one respectively' without implying sequence, while 一つ一つ stresses going through items in order or examining each carefully.
いちいちN3
一々 often carries a nuance of tedious or fussy repetition ('every single time'), while 一つ一つ is neutral and simply means going through items individually.
各おの々おのN2
各々 is a more formal, written word for 'each one', whereas 一つ一つ is common in everyday speech and often implies careful, one-by-one action.
一いっ個こ一いっ個こ
一個一個 is more concrete and object-focused, used for counting physical items one by one, while 一つ一つ can also apply to abstract things or detailed examination.
逐ちく一いちN1
一つ一つ focuses on handling each item individually, while 逐一 emphasizes covering every detail exhaustively and in order.

一いっ斉せいにN2
一斉に means 'all at once, simultaneously', the opposite of 一つ一つ's meaning of doing things one at a time in sequence.

一ひとつ一ひとつ
Standard kanji-kana mixed spelling; high frequency in news and general use.
１ひとつ１ひとつ
Numerical variant; common in informal or space-constrained writing.
一ひとつひとつ
Mixed kanji-kana variant; sometimes used for readability.

Reduplication of 一つ (ひとつ, 'one'), emphasizing individuality or sequential treatment.