#1 principal s. [chief, main, primary, 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". wn
#2 principal n. the original amount of a debt on which interest is calculated. wn
#3 principal n. [school principal, head teacher, head] the educator who has executive authority for a school; "she sent unruly pupils to see the principal". wn
#4 principal n. [star, lead] an actor who plays a principal role. wn
#5 principal n. [corpus, principal sum] capital as contrasted with the income derived from it. wn
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