noun
old style; ancient rites; traditional form
Refers to something done in a traditional, old-fashioned manner, often with a sense of formality or ceremony. Can describe rituals, customs, or stylistic choices.
古式にのっとった結婚式を挙げた。
We held a wedding ceremony in the traditional style.
この神社では古式ゆかしい祭りが行われる。
At this shrine, a festival rich in ancient tradition is held.
Compound of 古 (old) and 式 (style, ceremony). The exact historical derivation is uncertain, but the word has been used since at least the Edo period to refer to ancient or traditional forms and rituals.