noun (n)

• the act of expressing earnest opposition or protest(noun.communication)

  Synonym:
  objection, remonstrance, remonstration
  

  source: wordnet30
• an exclamation of protest or remonstrance or reproof(noun.communication)

  source: wordnet30
• The act of expostulating or reasoning with a person in opposition to some impropriety of conduct; remonstrance; earnest and kindly protest; dissuasion.(noun)

  source: webster1913