1. [n]  the act of protesting; a public (often organized) manifestation of dissent
2. [n]  a difference of opinion
3. [n]  (law) the difference of one judge's opinion from that of the majority; "he expressed his dissent in a contrary opinion"
4. [v]  withhold assent; "Several Republicans dissented"
5. [v]  be of different opinions; "I beg to differ!"; "She disagrees with her husband on many questions"
6. [v]  fight back, also metaphorically; "His body protested against the harsh training"

Dissent
Dissent

more details ...

1. \Dis*sent"\, v. i. [imp. & p. p. {Dissented}; p. pr. &
   vb. n. {Dissenting}.] [L. dissentire, dissentum; dis- +
   sentire to feel, think. See {Sense}.]
   1. To differ in opinion; to be of unlike or contrary
      sentiment; to disagree; -- followed by from.
            The bill passed . . . without a dissenting voice.
                                                  --Hallam.
            Opinions in which multitudes of men dissent from us.
                                                  --Addison.
   2. (Eccl.) To differ from an established church in regard to
      doctrines, rites, or government.
   3. To differ; to be of a contrary nature. --Hooker.
   

2. \Dis*sent"\, n.
   1. The act of dissenting; difference of opinion; refusal to
      adopt something proposed; nonagreement, nonconcurrence, or
      disagreement.
            The dissent of no small number [of peers] is
            frequently recorded.                  --Hallam.
   2. (Eccl.) Separation from an established church, especially
      that of England; nonconformity.
            It is the dissidence of dissent and the
            protestantism of the Protestant religion. --Burke.
   3. Contrariety of nature; diversity in quality. [Obs.]
            The dissent of the metals.            --Bacon.
   Syn: Disagreement; variance; difference; nonconcurrence;
        nonconformity.