Teacher \Teach"er\, n.

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.

Source: Webster's Revised Unabridged Dictionary (1913)