於いて, 於て: at, in (a location or time); on the part of; with regard to, regarding

Elongated form of よく (yoku).

ace up one's sleeve

to do something in preparation for something else / to do something and leave it in a certain state

at; in / on; upon / by; beside / at the time of

October

circle / yen

circular; round / smooth; harmonious / yen: the official currency of Japan

a surname / a female given name

(archaic) Alternative spelling of 丸 (“roundness, plumpness”)