secondary in WordNet English dictionary

1. inferior in rank or status
   "the junior faculty"; "a lowly corporal"; "petty officialdom"; "a subordinate functionary"
   junior-grade  lower-ranking  lowly  petty  secondary  subaltern 
   
2. 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"
   secondary 
   
3. depending on or incidental to what is original or primary
   "a secondary infection"
   secondary 
   
4. not of major importance
   "played a secondary role in world events"
   secondary 
   
5. belonging to a lower class or rank
   secondary 
   

1. coil such that current is induced in it by passing a current through the primary coil
   secondary coil  secondary winding  secondary 
   
2. the defensive football players who line up behind the linemen
   secondary