principal

principal　1.委托人，当事人；2.主事人；3.委托人；4.本金；5.面值　

1.law：（1）a party who designates another（the agent）to act on his or her behalf.（2）a party that has the primary responsibility in a liability or obligation，as opposed to an endorser，guarantor or surety.（3）a person who commits a crime，takes an active part in its commission，or directly or indirectly counsels or procures another person to commit it.2.commerce：a major party in a business transaction.3.contracts：a client who awards a contract to a contractor for completion of a job or project in accordance with terms of the contract.Also called owner.4.finance：capital as distinct from the income（interest）derived from it.5.securities：the par value of a security.