What is the meaning of secondary?

Noun

• (n.) secondary (the defensive football players who line up behind the linemen)
• (n.) secondary coil, secondary winding, secondary (coil such that current is induced in it by passing a current through the primary coil)

Adjective

• (adj.) secondary (being of second rank or importance or value; not direct or immediate) "the stone will be hauled to a secondary crusher"; "a secondary source"; "a secondary issue"; "secondary streams"
• (adj.) junior-grade, lower-ranking, lowly, petty, secondary, subaltern (inferior in rank or status) "the junior faculty"; "a lowly corporal"; "petty officialdom"; "a subordinate functionary"
• (adj.) secondary (depending on or incidental to what is original or primary) "a secondary infection"
• (adj.) secondary (not of major importance) "played a secondary role in world events"
• (adj.) secondary (belonging to a lower class or rank).