- Paren is short for parenthesis, which is a punctuation mark that encloses comments or information within a sentence, or is used in math equations.
An example of a paren is the mark on either side of the last word in this sentence (mostly).
paren definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
paren definition by American Heritage Dictionary