What is the meaning of instruction?

noun

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