[col.lab.o.rate] vi -rat.ed ; -rat.ing [LL collaboratus, pp. of collaborare to labor together, fr. L com- + laborare to labor] (1871) 1: to work jointly with others or together esp. in an intellectual endeavor
2: to cooperate with or willingly assist an enemy of one's country and esp. an occupying force
3: to cooperate with an agency or instrumentality with which one is not immediately connected -- col.lab.o.ra.tion n -- col.lab.o.ra.tive adj or n -- col.lab.o.ra.tive.ly adv -- col.lab.o.ra.tor n