1. (noun)direction, instruction a message describing how something is to be done
"he gave directions faster than she could follow them"
2. (noun)education, instruction, teaching, pedagogy, didactics, educational activity the activities of educating or instructing; activities that impart knowledge or skill "he received no formal education"; "our instruction was carefully programmed"; "good classroom teaching is seldom rewarded"
3. (noun)teaching, instruction, pedagogy the profession of a teacher "he prepared for teaching while still in college"; "pedagogy is recognized as an important profession"
4. (noun)instruction, command, statement, program line (computer science) a line of code written as part of a computerprogram