principal

adj. chief, head, leading; primary, main, major; first in rank, of the highest importance or priority

n. school director, school master; capital sum (Finance)

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Noun
1. the original amount of a debt on which interest is calculated
(hypernym) debt
(part-holonym) loan
2. the educator who has executive authority for a school; "she sent unruly pupils to see the principal"
(synonym) school principal, head teacher, head
(hypernym) educator, pedagogue
(hyponym) chancellor
3. an actor who plays a principal role
(synonym) star, lead
(hypernym) actor, histrion, player, thespian, role player
(hyponym) co-star
4. capital as contrasted with the income derived from it
(synonym) corpus, principal sum
(hypernym) capital
5. the major party to a financial transaction at a stock exchange; buys and sells for his own account
(synonym) dealer
(hypernym) financier, moneyman
(hyponym) broker-dealer

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Adjective
1. 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"
(synonym) chief(a), main(a), primary(a), principal(a)
(similar) important, of import

adj. principal, fundamental; leading, cardinal; central, close, foremost; main; prime, right

nm. master, principal; headmaster, provost; arch, princedom

adj. principal, prime; cardinal; grand, great; top, uppermost

nm. head, chief; principal; chief officer