principal
prin-ci-pal
noun
An original sum of money lent or invested, excluding interest.
"Repay the principal amount plus interest."
noun
The person in charge of a school or college.
"The school principal greeted new pupils."
adjective
Most important, main, or highest in rank.
"The principal reason for the meeting was urgent."
Thesaurus
Synonyms: dealer, corpus, principal sum, star, lead, head, head teacher, school principal