'objection' definitions:

Definition of 'objection'

From: WordNet
noun
The act of expressing earnest opposition or protest [syn: expostulation, remonstrance, remonstration, objection]
noun
The speech act of objecting
noun
The act of protesting; a public (often organized) manifestation of dissent [syn: protest, objection, dissent]
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

Synonyms of 'objection'

From: Moby Thesaurus