noun (n)

• a message describing how something is to be done(noun.communication)

  Synonym:
  direction
  

  source: wordnet30
• the activities of educating or instructing; activities that impart knowledge or skill(noun.act)

  Example:
  Our instruction was carefully programmed.
  

  Synonym:
  didactics, education, educational activity, pedagogy, teaching
  

  source: wordnet30
• the profession of a teacher(noun.act)

  Synonym:
  pedagogy, teaching
  

  source: wordnet30
• (computer science) a line of code written as part of a computer program(noun.communication)

  Synonym:
  command, program line, statement
  

  source: wordnet30
• The act of instructing, teaching, or furnishing with knowledge; information.(noun)

  source: webster1913