dissent

Short definition from Wiktionary

Verb

1. 1
   To disagree; to withhold assent. Construed with from (or, formerly, to).
2. 2
   To differ from, especially in opinion, beliefs, etc.
3. 3
   To be different; to have contrary characteristics.

Noun

1. 1
   Disagreement with the ideas, doctrines, decrees, etc. of a political party, government or religion.
2. 2
   An act of disagreeing with, or deviating from, the views and opinions of those holding authority.
3. 3
   A separate opinion filed in a case by judges who disagree with the outcome of the majority of the court in that case
4. 4
   A violation that arises when disagreement with an official call is expressed in an inappropriate manner such as foul language, rude gestures, or failure to comply.