handshake

noun

1. The grasping of hands by two people when greeting, leave-taking, or making an agreement.

   “Eccles' handshake, eager and practiced and hard, seems to symbolize for him an embrace. For an instant Rabbit fears he will never let go.”

2. An exchange of signals between two devices when communications begin in order to ensure synchronization.

verb

1. (intransitive)To perform a handshake; to shake hands.
2. (intransitive)To perform a handshake with another device.