(US) The generic term for the principal instructor of fresh military recruits undergoing basic training in the various branches of the United States military, routinely abbreviated to the initialism DI; always filled by enlisted personnel (a sergeant or petty officer).

plural of drill instructor

plural of instructor

(dated) A female instructor.

(archaic) third-person singular simple present indicative form of instruct

(dated) A female instructor.

plural of instructress

A branch of education that studies the way in which instruction is used to impart knowledge or understanding

Of or pertaining to instructology

The office of an instructor / the term of this office