expression, noun-modifying (irregular)
extending over many years; spanning several years
Rare, formal expression used as a prenominal modifier to describe something that lasts or continues for a long period of years. Often found in written or literary contexts.
After many years of research, the new drug was finally completed.
This is the fruit of many years of effort.
More common and neutral expression for 'over many years'; 幾年にもわたる is rarer and more literary.
Standard kanji spelling using わたる.
Alternate kanji for わたる, commonly used for spanning time or space.
Uncommon kanji variant for わたる.
Archaic kanji variant for わたる; rarely used in modern Japanese.
Phrase composed of 幾年 (many years) + に (particle) + も (emphasis) + わたる (to extend over). The exact origin is transparent from its components.