comrade (n.)

1590s, "one who shares the same room," hence "a close companion," from French camarade (16c.), from Spanish camarada "chamber mate," or Italian camerata "a partner," from Latin camera "vaulted room, chamber" (see camera). In Spanish, a collective noun referring to one's company. In 17c., sometimes jocularly misspelled comrogue. Used from 1884 by socialists and communists as a prefix to a surname to avoid "Mister" and other such titles. Related: Comradely; comradeship.

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Definitions of comrade from WordNet
comrade (n.)
a friend who is frequently in the company of another;
comrades in arms
comrade (n.)
used as a term of address for those male persons engaged in the same movement;
Greetings, comrade!
Synonyms: brother
Comrade (n.)
a fellow member of the Communist Party;