noun, adverb
the year after next
Refers to the year that follows the coming year. Used both as a noun and adverbially.
明後年、私は大学を卒業する予定です。
I plan to graduate from university the year after next.
このプロジェクトは明後年まで続きます。
This project will continue until the year after next.
再来年 is a more common synonym for 'the year after next'. 明後年 is less frequent and may be considered slightly more formal or literary.
Compound of 明 (みょう, 'next') + 後 (ご, 'after') + 年 (ねん, 'year'). The reading みょう is an older Sino-Japanese reading of 明 meaning 'next', as also seen in 明日 (みょうにち, 'tomorrow').