acceptor

Short definition from Wiktionary

Noun

1. 1
   One who accepts.
2. 2
   One who accepts a draft or a bill of exchange; a drawee after he has accepted.
3. 3
   An atom or molecule which can accept an electron to form a chemical bond.
4. 4
   A transfer RNA molecule that can accept a specific amino acid
5. 5
   A chemical acceptor atom forming a positive hole in a semiconductor
6. 6
   A cluster of skin cells that respond to pain
7. 7
   A kind of finite-state machine whose binary output indicates whether or not a received input was accepted.