ordained minister; regular teacher
A formal title for a fully qualified minister or teacher, especially in Christian contexts. The 'regular teacher' sense is less common and may appear in older educational settings.
He was appointed as an ordained minister of the church.
That school requires a regular teacher's license.
Compound of 正 (せい, 'regular, proper') and 教師 (きょうし, 'teacher, minister'). The exact historical derivation is uncertain, but it follows a common pattern for formal titles.