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

(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)

one week

one (of anything) / a, an

one (of anything) / a, an

one school / whole school / first draft / first revision

a scroll

a complete set of something, a complete suit of clothes

a female given name