Wiktionary
n. A bank account owned jointly by two or more persons.
Wikipedia
A joint account is a bank account shared by two or more individuals. Any individual who is a member of the joint account can withdraw from the account and deposit to it. Usually, joint accounts are shared between close relatives or business partners.
Usage examples of "joint account".
They were contemplating a divorce, and could Lester help them close out their joint account right away?
They still had a joint account, not that there was ever much in it.
I've taken it from our joint account, and I suspect that the moment Rick knows I'm gone, he'll try to empty the accounts himself.
They had given his toys to the Goodwill Shop in Norton, they had transferred his bank account of a thousand dollars (college moneyhalf of everything Charlie had gotten from relatives at birthdays and Christmas went into that account, over his howls of protest) to their own joint account.
The remaining thirty-six thousand was deposited with Manufacturers Hanover Trust in a joint account.