callee

From call +‎ -ee.

callee (plural callees)

1. (telephony) The person who is called by the caller (on the telephone).
2. (programming) A function called by another.
   • 1975, Gerald Jay Sussman and Guy L. Steele, Jr., Scheme: An Interpreter for Extended Lambda Calculus, MIT AI Lab, page 24:

     The interpreter must provide for correctly resuming the caller when the callee has returned its value.

• collect call

• cellae