the first day of the month (solar or lunar calendar)

(literary) one day, 24 hours / (literary) the daytime, the period from dawn until dusk / (literary) (figuratively) a short period of time

(obsolete) one day, 24 hours / (obsolete) the daytime, the period from dawn until dusk

(rare, obsolete) (all senses appear to be identical as for hitohi above)

morning

the morning

(archaic) the morning, morn / (archaic) the morrow, next morning

the morning / an imperial court / a country governed by a monarch / a bustling place, such as downtown / an imperial reign or dynasty

dynasty

imperial court / (by extension) Japan / having an audience with the emperor / dynasty, regime / (by extension) epoch, period