Open English Wordnet
Nouns
(n)principalthe original amount of a debt on which interest is calculated (n)principal(criminal law) any person involved in a criminal offense, regardless of whether the person profits from such involvement (n)principal, dealerthe major party to a financial transaction at a stock exchange; buys and sells for their own account Adjectives
(s)chief, main, primary, principal, mastermost 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”