v. i. To give instruction; to follow the business, or to perform the duties, of a preceptor. [ 1913 Webster ]

And gladly would he learn, and gladly teach. Chaucer. [ 1913 Webster ]

The priests thereof teach for hire. Micah iii. 11. [ 1913 Webster ]

v. t. [ imp. & p. p. Taught p. pr. & vb. n. Teaching. ] [ OE. techen, imp. taughte, tahte, AS. t&aemacr_;cean, imp. t&aemacr_;hte, to show, teach, akin to tācn token. See Token. ] 1. To impart the knowledge of; to give intelligence concerning; to impart, as knowledge before unknown, or rules for practice; to inculcate as true or important; to exhibit impressively; as, to teach arithmetic, dancing, music, or the like; to teach morals. [ 1913 Webster ]

If some men teach wicked things, it must be that others should practice them. South. [ 1913 Webster ]

2. To direct, as an instructor; to manage, as a preceptor; to guide the studies of; to instruct; to inform; to conduct through a course of studies; as, to teach a child or a class. “He taught his disciples.” Mark ix. 31. [ 1913 Webster ]

The village master taught his little school. Goldsmith. [ 1913 Webster ]

3. To accustom; to guide; to show; to admonish. [ 1913 Webster ]

I shall myself to herbs teach you. Chaucer. [ 1913 Webster ]

They have taught their tongue to speak lies. Jer. ix. 5. [ 1913 Webster ]

☞ This verb is often used with two objects, one of the person, the other of the thing; as, he taught me Latin grammar. In the passive construction, either of these objects may be retained in the objective case, while the other becomes the subject; as, I was taught Latin grammar by him; Latin grammar was taught me by him. [ 1913 Webster ]

Syn. -- To instruct; inform; inculcate; tell; guide; counsel; admonish. See the Note under Learn. [ 1913 Webster ]

a. Capable of being taught; apt to learn; also, willing to receive instruction; docile. [ 1913 Webster ]

We ought to bring our minds free, unbiased, and teachable, to learn our religion from the Word of God. I. Watts. [ 1913 Webster ]

n. Willingness to be taught. [ 1913 Webster ]

n. [ Cf. Amer. Sp. tacha, tacho. ] (Sugar Manuf.) Any one of the series of boilers or evaporating pans in which the cane juice is concentrated in making sugar; especially, the last boiler of the series. Ure. [ 1913 Webster ]

The 1890 edition had the following etymology for teache: [ Cf. Ir. teaghaim, Gael. teasaich, to heat. ]. Presumably a speculation which proved incorrect?

n. 1. One who teaches or instructs; one whose business or occupation is to instruct others; an instructor; a tutor. [ 1913 Webster ]

2. One who instructs others in religion; a preacher; a minister of the gospel; sometimes, one who preaches without regular ordination. [ 1913 Webster ]

The teachers in all the churches assembled. Sir W. Raleigh. [ 1913 Webster ]

n. The act or business of instructing; also, that which is taught; instruction. [ 1913 Webster ]

Syn. -- Education; instruction; breeding. See Education. [ 1913 Webster ]

a. Not teachable. [ R. ] Shelley. [ 1913 Webster ]

n. A small cup from which to drink tea. [ 1913 Webster ]

n.; pl. Teacupfuls As much as a teacup can hold; enough to fill a teacup. [ 1913 Webster ]