Key Terms

1. Showing the way; direction, guidance. Obs.
2a. The imparting of instruction or knowledge; the occupation or function of a teacher.
2b. That which is taught; a thing taught, doctrine, instruction, precept.
3. Delivering, handing over. Obs. rare.
1. The act of searching (closely or carefully) for or after a specified thing or person.
2.a. A search or investigation directed to the discovery of some fact by careful consideration or study of a subject; a course of critical or scientific inquiry. (Usu. in pl.)
2b Without article: Investigation, inquiry into things. Also, as a quality of persons, habitude of carrying out such investigation.
3. Investigation or pursuit of a subject. rare.

Oxford English Dictionary