Matter and Antimatter are always created in pairs, with the exception of CP Symmetry Violation. Thus, in order for some quantum properties to be conserved, these properties must be opposite in the particle and antiparticle created.
An example of that is electrical charge, which is a conserved quantum property. When a particle-antiparticle pair is created, they must have opposite charges for charge to be conserved.
Therefore, is it right to conclude and define an antiparticle as a particle with opposite conserved quantum properties?