principal

Adjective

• most important element
  • the chief aim of living
    
  • the main doors were of solid glass
    
  • the principal rivers of America
    
  • the principal example
    
  • policemen were primary targets
    
  • the master bedroom
    
  • a master switch
    

Noun

• the major party to a financial transaction at a stock exchange; buys and sells for his own account

• (criminal law) any person involved in a criminal offense, regardless of whether the person profits from such involvement

• capital as contrasted with the income derived from it

• an actor who plays a principal role

• the educator who has executive authority for a school
  • she sent unruly pupils to see the principal
    

• the original amount of a debt on which interest is calculated

Related words

• Synonyms: 
  chief(a) , main(a) , primary(a) , principal(a) , master(a) , dealer , corpus , principal sum , star , lead , school principal , head teacher , head