経けい年ねん

noun

passing of years; aging over time

Refers to the effect of time on objects, materials, or conditions; often used in technical or formal contexts such as 経年変化 (secular change) or 経年劣化 (aging deterioration).

• この建たて物ものは経けい年ねんによる劣れっ化かが進すすんでいる。

  This building is deteriorating due to aging.

• 経けい年ねん変へん化かを考こう慮りょして設せっ計けいする必ひつ要ようがある。

  It is necessary to design taking secular change into account.