dissent

(noun) (law) the difference of one judge's opinion from that of the majority. Example: "He expressed his dissent in a contrary opinion."

(noun) a difference of opinion.

(noun) the act of protesting; a public (often organized) manifestation of dissent. Synonyms: protest, objection.

(verb) withhold assent. Example: "Several republicans dissented."

(verb) express opposition through action or words. Synonyms: protest, resist. Example: "Dissent to the laws of the country."

(verb) be of different opinions. Synonyms: disagree, differ, take issue. Examples: "I beg to differ!." "She disagrees with her husband on many questions."