1. (noun) principal
the original amount of a debt on which interest is calculated
2. (noun) principal, school principal, head teacher, head
the educator who has executive authority for a school
"she sent unruly pupils to see the principal"
3. (noun) star, principal, lead
an actor who plays a principal role
4. (noun) principal, corpus, principal sum
capital as contrasted with the income derived from it
5. (noun) principal
(criminal law) any person involved in a criminal offense, regardless of whether the person profits from such involvement
6. (adj) principal, dealer
the major party to a financial transaction at a stock exchange; buys and sells for his own account
7. (adj) chief(a), main(a), primary(a), principal(a), master(a)
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"
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Definition of 'principal' 
