1A prefix attached to time words (like 来年 'next year', 来月 'next month') meaning 'next' or 'the coming ~'.
来年の春に結婚する予定です。
We're planning to get married next spring.
来週の会議までに資料を準備してください。
Please prepare the materials by next week's meeting.
来学期からクラスが変わるらしい。
It seems the classes will change starting next semester.
来シーズンはもっと強いチームになりたい。
Next season, we want to become an even stronger team.
2A suffix attached after a duration or time-point word to mean 'for (a period)' or 'since ~', continuing up to the present — a somewhat formal, written-style usage, as in 二十年来 ('for twenty years') or 先月来 ('since last month').
彼らは十年来の親友だ。
They have been close friends for ten years.
先月来、彼から連絡が一切ない。
There has been no contact from him at all since last month.