Etymology
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colleague (n.)

"an associate in office, employment, or labor," 1530s, from French collègue (16c.), from Latin collega "partner in office," from assimilated form of com "with, together" (see com-) + leg-, stem of legare "send as a deputy, send with a commission," from PIE root *leg- (1) "to collect, gather." So, "one sent or chosen to work with another," or "one chosen at the same time as another."

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Definitions of colleague

colleague (n.)
an associate that one works with;
Synonyms: co-worker / fellow worker / workfellow
colleague (n.)
a person who is member of one's class or profession;
the surgeon consulted his colleagues
Synonyms: confrere / fellow
From wordnet.princeton.edu