From WordNet (r) 3.0 (2006) :
interpreter
n 1: someone who mediates between speakers of different
languages [syn: interpreter, translator]
2: someone who uses art to represent something; "his paintings
reveal a sensitive interpreter of nature"; "she was famous as
an interpreter of Shakespearean roles"
3: an advocate who represents someone else's policy or purpose;
"the meeting was attended by spokespersons for all the major
organs of government" [syn: spokesperson, interpreter,
representative, voice]
4: (computer science) a program that translates and executes
source language statements one line at a time [syn:
interpreter, interpretive program]