Upon dissociating N2O as a monomer and in N2O .(H2O)(m) (m = 1-3), resulting N-2 (J = 74) time-of-flight is measured. The photolysis of the complexes proceeds as the two-body dissociation. The fragment＇s angular distribution is anisotropic. The velocity of N-2 originating from the monomer dissociation is well defined, but those originating from the dissociation in the complexes have their maximum velocity increased up to 36%. This is possible when the kinematic constraints for N2O dissociation in the complex incorporate the mass of O .(H2O)(m) as the counter fragment of N-2. Its implication for a reaction taking place in a complex is discussed.