an act or instance of selecting or the state of being selected; choice.
a thing or a number of things selected.
an aggregate of things displayed for choice, purchase, use, etc.; a group from which a choice may be made:
The store had a wide selection of bracelets.
Biology. any natural or artificial process that results in differential reproduction among the members of a population so that the inheritable traits of only certain individuals are passed on, or are passed on in greater proportion, to succeeding generations.