Basic Guidelines For English Spellings
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See US English definition of principal
See UK English definition of principal
See Spanish definition of principal
1‘vehicle emissions are the principal cause of bad air’
minor, subordinate, subsidiary
1‘the principal of the firm of contractors’
2‘the school's principal’
3‘she is currently a principal in a soap opera’
4‘no repayment of the loan's principal is required for the first few years’