於

定義

1. in (defines a place, a moment, a concept in order to describe its relationship with the surroundings)
   Jinmeiyō, kanji
2. at; sometimes appears on signage to designate the location or time of an event, preposed as in classical Chinese (but in contravention of Japanese word order).

等価語

例文

“於：会議室”

at: meeting room

CEFRレベル