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"最も重要な要素基幹的
例:The principal rivers of America. アメリカの主要な川。
an actor who plays a principal role主役を演じる俳優主演者
capital as contrasted with the income derived from itそこから派生する収入と区別する資本元金
the original amount of a debt on which interest is calculated借り入れ時の元金でこれに利子が付く元高
the major party to a financial transaction at a stock exchange; buys and sells for his own account証券取引所における金融取引に対する大政党商人