斉せい一いつ説せつ

noun

uniformitarianism

Technical term in geology and historical linguistics; the principle that the same natural laws and processes that operate now have always operated in the past.

• 斉せい一いつ説せつは地ち質しつ学がくの基き本ほん原げん理りの一ひとつである。

  Uniformitarianism is one of the fundamental principles of geology.