一昨々年さきおととし

noun, adverb

three years ago; the year before last year's last year

Refers to the year three years prior to the current year. Can be used as a noun or adverb. The reading さきおととし is most common in speech; いっさくさくねん is formal and literary.

• 一さき昨々おと年としの夏なつはとても暑あつかった。

  The summer three years ago was very hot.

• 彼かれはさきおととし大だい学がくを卒そつ業ぎょうした。

  He graduated from university three years ago.