strike with the flat of the hand; usually in a friendly way, as in encouragement or greeting(verb.contact)
source: wordnet30
strike together so as to produce a sharp percussive noise(verb.contact)
Example: Clap two boards together.
source: wordnet30
To strike; to slap; to strike, or strike together, with a quick motion, so, as to make a sharp noise; as, to clap one's hands; a clapping of wings.(verb)