1. entering; entrance; entry
彼はまだ会場入りしてないって。They say he hasn't entered the venue yet.
2. attendance; audience; number (of visitors, customers, etc.)
朝食の時間だからか、客入りも良さそうだ。Perhaps because it is breakfast time, the number of customers seems good.
3. containing
ミルク抜きの砂糖入りを頼む。I'll have it with sugar and no milk.
4. income; earnings; takings
なんだかんだで金の入りが良い奴だ。One way or another, that guy always has plenty of money coming in.
5. expenses; expenditure
also written as 要り
6. setting (of the Sun or Moon)
7. beginning (of the equinoctial week, midsummer, etc.); start; first day