斉せい一いつ説せつせいいつせつMeanings1noununiformitarianismTechnical 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
