intransitive verb.
To work together, especially in a joint intellectual effort.
intransitive verb.
To cooperate treasonably, as with an enemy occupation force in one's country.
The Century Dictionary and Cyclopedia
To work with another or others; coöperate with another or others in doing or producing something; especially, to work with another in a literary production or a scientific investigation.
the GNU version of the Collaborative International Dictionary of English
intransitive verb.
to work together with another toward a common goal, especially in an intellectual endeavor.
intransitive verb.
to willingly cooperate with an enemy, especially an enemy nation occupying one's own country.
verb.
To worktogether with others to achieve a commongoal.
verb.
To voluntarily cooperatetreasonably, as with an enemy occupation force in one's country.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
verb.
work together on a common enterprise of project
verb.
cooperate as a traitor
Word Usage
"Frankly, it'd be a good area for conservatives and libertarians to once again collaborate, because neither side has enough media assets to mount a serious challenge."