necessity (quality or state of being necessary, unavoidable, or absolutely requisite)

unnecessary

needlessness

necessary evil

the first sight of something / something seen for the first time

Alternative spelling of 見始め

(especially 初め) beginning, the start of an activity or time period / (especially 始め) origin, beginning of a thing

Doing a number of traditional things that commemorate a new year. / (by extension, informal) Having sex for the first time in a new year.

first of all; firstly

at the beginning of ~