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