1The year two years before a given year; a formal expression equivalent to the colloquial 'ototoshi' (the year before last).
前々年の売上と比較して、今年は増加した。
Compared with the year before last, sales have increased this year.
前々年に行った調査を基に、新しい方針を立てた。
Based on the survey conducted the year before last, we established a new policy.
統計では前年・前々年との比較がよく行われる。
Statistics often compare with the previous year and the year before last.