Webster's Revised Unabridged Dictionary · 1913

Teacher

Teacher , noun

1.
One who teaches or instructs; one whose business or occupation is to instruct others; an instructor; a tutor.
2.
One who instructs others in religion; a preacher; a minister of the gospel; sometimes, one who preaches without regular ordination.
The teachers in all the churches assembled. — Sir W. Raleigh