This is the 7537th most frequent Japanese word.
再任
Reappointment.
The word 再任 (sainin) here is used as a noun describing the action of being reappointed.
彼は次の選挙で再任される可能性が高い。
He is likely to be reappointed in the next election.
In this sentence, 再任 is used as a noun referring to the act or event of reappointment.
市長の再任にはいくつかの条件がある。
There are several conditions for the mayor's reappointment.
Here, 再任 is used as a concept that can be influenced, indicating one aspect of its noun usage.