objection

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The act of objecting.
• noun Law The formal registration of protest against the admission of a piece of evidence at trial, on the grounds of some legal defect.
• noun A statement presented in opposition.
• noun A ground, reason, or cause for expressing opposition.

from The Century Dictionary.

• noun The act of objecting or throwing in the way; the act of resisting by words spoken or written, by or without stating adverse reasons or arguments, advancing criticisms, or suggesting difficulties, etc.
• noun That which is interposed or presented in opposition; an adverse contention, whether by or without stating the opinion, reason, or argument on which it is founded: as, many objections to that course were urged; the objections of the defendant were overruled.
• noun An adverse blow; an attack.
• noun Trouble; care; cause of sorrow or anxiety.
• noun Synonyms Exception, difficulty, doubt, scruple, cavil, demurrer.

from the GNU version of the Collaborative International Dictionary of English.

• noun The act of objecting.
• noun That which is, or may be, presented in opposition; an adverse reason or argument; a reason for objecting; obstacle; impediment
• noun Obs. or R. Cause of trouble; sorrow.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun The act of objecting.
• noun A statement expressing opposition, or a reason or cause for expressing opposition (generally followed by the adposition to)
• noun law An official protest raised in a court of law during a legal trial over a violation of the rules of the court by the opposing party.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the act of protesting; a public (often organized) manifestation of dissent
• noun the speech act of objecting
• noun the act of expressing earnest opposition or protest
• noun (law) a procedure whereby a party to a suit says that a particular line of questioning or a particular witness or a piece of evidence or other matter is improper and should not be continued and asks the court to rule on its impropriety or illegality