also: おとつい · いっさくじつ
noun, adverb
day before yesterday
Refers to the day before yesterday. Can be used as a noun or adverbially without a particle in casual speech.
一昨日は雨だった。
The day before yesterday was rainy.
おととい、友達と映画を見に行った。
I went to see a movie with a friend the day before yesterday.
Standard kanji spelling; high priority.
Formal or literary reading; used in official or written contexts.
Common kana spelling, especially in casual writing or when avoiding the kanji.
Dialectal or older pronunciation variant; rarely used in standard modern Japanese.
The kanji 一昨日 literally mean 'one before yesterday'. The reading おととい is a jukujikun (special kanji reading) of native origin, while いっさくじつ is the on'yomi reading used in formal contexts.