ごとに

Meanings

each; every; at intervals of

usually written using kana alone

Attaches to nouns, counters, or verbs to express 'each time', 'every', or 'per'. With time/distance nouns it means 'at intervals of'. With verbs it means 'each time one does'.

この電でん車しゃは10分ぷんごとに出でます。
This train departs every 10 minutes.
彼かれは会あう人ひとごとに挨あい拶さつする。
He greets each person he meets.
季き節せつごとに違ちがう花はなが咲さく。
Different flowers bloom each season.

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Grammar

おきに・ごとにevery; every other; for eachN4

Kanji

毎every

Related words

お気きに
ごとに marks each occurrence or unit (every time, per unit), while おきに emphasizes the interval left between occurrences, as in 1日おきに (every other day).
ずつN4
ごとに marks the unit or occasion itself (each time/per unit), whereas ずつ distributes a fixed quantity evenly, as in 一人に一つずつ (one each per person).
ごとN2
毎に is the common adverbial form used before verbs to mean 'each time', while 毎 is the bare suffix attached directly to a noun to mean 'each'.
たびに
度に means 'every time (something happens)' and focuses on a recurring event, while ごとに means 'every' in the sense of regular intervals or individual units (年ごとに, 家ごとに).
につき
ごとに is the plain way to say 'per/each', matching に付き's distributive 'per' sense but without its formal, business-document tone.

Etymology

Derived from the noun 毎 (ごと, 'each') + particle に. The kanji 毎 is used for 'every' or 'each', but the kana form ごとに is now standard.