na-adjective
customary; conventional; usual
Describes something done according to established custom or common practice, often in formal or institutional contexts.
慣例的な手続きに従って会議を進めた。
We proceeded with the meeting according to customary procedures.
この式典では慣例的なあいさつが行われる。
A conventional greeting is given at this ceremony.
一般的 means 'general' or 'common' in a broad sense, whereas 慣例的 specifically implies adherence to established custom or precedent.
Formed from 慣例 (custom, precedent) + 的 (-like, -ish), a common pattern for creating adjectival nouns.