to work jointly with others or together especially in an intellectual endeavor.
Work jointly on an activity, esp. to produce or create something
Cooperate traitorously with an enemy
to work jointly with others or together esp in an intellectual endeavor [v COLLABORATED, COLLABORATING, COLLABORATES]
can also be used disapprovingly to mean to cooperate with or willingly assist an enemy of ones country and especially an enemy who occupies it during a war.
means to work jointly with others or together especially in an intellectual endeavor.