primaryclient

noun
UK /ˈpraɪməri ˈklaɪənt/
US /ˈpraɪmɛri ˈklaɪənt/

The main person or company that a business helps and works for.

The design firm's primary client approved the new logo.


OTHER MEANINGS

2. The first or most important person receiving a professional service, such as in law or healthcare.

The lawyer met with her primary client before the hearing.

3. In computing, the main device or user that connects to a server or network.

The primary client on the network requested the latest update.

4. The leading buyer whose needs guide a company's product decisions.

Feedback from the primary client shaped the software's new features.