Chapter Sermonic to Serve of S by Webster's Dictionary (1913 Edition)

3. To be in service; to do duty; to discharge the requirements of an office or employment. Specifically, to act in the public service, as a soldier, seaman. etc.

Many . . . who had before been great commanders, but now served as private gentlemen without pay.

Knolles.

4. To be of use; to answer a purpose; to suffice; to suit; to be convenient or favorable.

This little brand will serve to light your fire.

Dryden.

As occasion serves, this noble queen
And prince shall follow with a fresh supply.

Shak.

5. (Tennis) To lead off in delivering the ball.