Client/ˈklaɪənt/ Definition 1 of 3Pro Tip 1/3Service Relationship Emphasizes ongoing interaction between the client and the service provider. As a client, she regularly checked in with her consultant. Pro Tip 2/3Professional Context Often used in formal or business situations where services are exchanged. The agency's clients expect high-quality service. Pro Tip 3/3Not Just Purchases A client implies more than just a transaction; it includes advice or expertise. As her client, I trust her financial advice.