the GNU version of the Collaborative International Dictionary of English
n. One who objects; one who offers objections to a proposition or measure.
The Century Dictionary and Cyclopedia
n. One who objects or interposes an adverse opinion, reason, or argument; one who is unwilling to receive and abide by a proposition, decision, or argument advanced, or offers opposing opinions, arguments, or reasons.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. a person who dissents from some established policy
Word Usage
"The tone taken by the objector is instructive and always the same."