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)

timetable

an hour-long period

(dialect, Ibaraki) time / (dialect, Ibaraki) hour / (dialect, Ibaraki) the hours or time when something happens

(dialect, Ibaraki) an hour-long period

video game console

(BDSM) act of humiliation where the bottom (usually female) has her pubic hair shaven with express or, more often, implied coercion.