To work together, especially in a joint intellectual effort.
To cooperate treasonably, as with an enemy occupation force in one's country.
[Late Latin collabōrāre, collabōrāt- : Latin com-, com- + Latin labōrāre, to work (from labor, toil).] col·lab'o·ra'tion n., col·lab'o·ra'tive adj., col·lab'o·ra'tor n.
1871, back-formation from collaborator (1802), from Fr. collaborateur, from L. collaboratus, pp. of collaborare "work with," from com- "with" + labore "to work." Collaboration "traitorous cooperation with the enemy," dates from 1940, originally in reference to the Vichy Government of France.
Main Entry: col·lab·o·rate Pronunciation: k&-'la-b&-"rAt Function: intransitive verb Inflected Forms: -rat·ed; -rat·ing : to work jointly with others in some endeavor