累るい年ねん

noun, adverb

successive years; over the years

Used in formal or written contexts to describe something that has continued or accumulated over multiple years. Often appears as an adverb with に or in compound expressions.

• 累るい年ねんの研けん究きゅうの成果せいかがつがついに発表いにっぴょうされた。

  The results of years of research were finally announced.