to teach (in the same broad application)

1. to teach

a. to hold discourse with others in order to instruct them, deliver didactic discourses

b. to be a teacher

c. to discharge the office of a teacher, conduct one's self as a teacher

2. to teach one

a. to impart instruction

b. instill doctrine into one

c. the thing taught or enjoined

d. to explain or expound a thing

e. to teach one something