noun
teaching license; teacher's license
Official certification required to teach in Japanese schools. Often used in contexts of obtaining, renewing, or holding the license.
彼は教員免許を取得するために大学で勉強している。
He is studying at university to obtain a teaching license.
教員免許の更新が必要になった。
I needed to renew my teaching license.
Compound of 教員 (teacher) and 免許 (license). The exact historical derivation is straightforward; the term has been used since the modern Japanese education system was established.