(obsolete) mailbox / (US, Brazil, obsolete) post office box; PO box

mail / stagecoach stop

a box-shaped receptacle, e.g. a coin bank or letter box (e.g. 銭函, 投函する) / to insert [into a container] (cf. 入れる, 容れる) / a suit of armor (more commonly 鎧)

the past / ancient times

(not of a person) old, aged, antiquated

old

age, era, period (of time) / the times, spirit of the age / antiquity / a time in one's life, one's days (in college etc.)

Kyūjitai form of 函数 (“function”)

armorer; armourer

an underground channel or tunnel with a rectangular cross-section