Joint Account

A brokerage or bank account that is owned together (jointly) by two or more people.

Investopedia Says:
A joint account agreement is typically needed to open such an account. This agreement will detail whether transactions require the signatures of all parties or whether one party can take actions on his/her own.

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1. Bank account owned by two or more persons, who equally share rights and liabilities of the account. Ownership of joint accounts can be set up in either of two ways: (1) a joint tenancy account (commonly used by husband and wife), in which either, acting separately, can make deposits or withdrawals at any time, and when one owner dies, the full account passes to the surviving owner; (2) tenants in common (commonly used by business partners), in which the approval of both owners is needed to make withdrawals. If one owner dies, the other shares the account equally with the deceased owner's estate. See also Joint Tenants With Right of Survivorship; Tenancy By the Entirety; Tenancy in Common.

2. Investment banking account formed by several underwriters acting as a syndicate. See also Jointly and Severally; Severally But Not Jointly.

A bank account in the name of two or more persons, each of whom has the power to withdraw funds.