dissident (n.) Look up dissident at Dictionary.com
1766, in reference to Protestants, from dissident (adj.). In the political sense first used 1940, coinciding with the rise of 20c. totalitarian systems, especially with reference to the Soviet Union.
dissident (adj.) Look up dissident at Dictionary.com
1530s, from Latin dissidentem (nominative dissidens), present participle of dissidere "to be remote; disagree, be removed from," literally "to sit apart," from dis- "apart" (see dis-) + sedere "to sit," from PIE root *sed- (1) "to sit."