初

fee for an initial medical examination

first song or chirp, etc. (in the year) of a particular bird or insect species

first cockcrowing of the year

newborn baby

first bath of the year

first train (of the day)

first telegram (about a particular topic)

first sale of the year; first trade of the year

beginning

outset; beginning; starting (things)

resuming work after the New Year's vacation

first bath of the year

first bath in one's life (i.e. for a baby)

first wearing (of kimono) in the New Year

New Year's ceremony in which a hoe is used to break ground in a field lying in a lucky direction

first birthday

sky on New Year's morning

first wearing (of new clothes)

first fruits

going shopping on January 2

weaning ceremony

Computing

initial point

first half of a tea ceremony (in which the charcoal is set and light food served)

Mathematics

primitive element (of a finite field)

first lull of the year; lull on New Year's Day

tenth lunar month

4th month of the lunar calendar