1.
new entry, newly joined
Describes someone who has recently entered or joined an organization, school, or group. Almost always used as a modifier before another noun.
新入社員の研修が始まった。
The training for new employees has started.
新入生を歓迎するパーティーを開いた。
We held a party to welcome the new students.
今年の新入部員は去年より多く、活気がある。
This year's new club members are more numerous than last year, and there's a lot of energy.
Used almost exclusively as a compound modifier:
- 新入社員 (new employee)
- 新入生 (new student)
- 新入部員 (new club member)
Contrast with 新人, which can stand alone as a noun meaning "newcomer" or "rookie".