client accountnoun [ C ]
ukusBANKING a bank account that a person, business, or organization keeps for a customer in order to keep the customer's money separate from their own:
Solicitors have a duty to account to their clients for interest earned by placing such monies in a solicitor's client account.
MARKETING a customer who regularly buys advertising from an advertising agency:
The agency was threatened with the loss of an important client account.