Selection - noun 1. an act or instance of selecting or the state of being selected; choice. 2. a thing or a number of things selected. 3. 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. 4. 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. Compare natural selection, sexual selection, kin selection, artificial selection.
Recruitment - noun 1. the act or process of recruiting. 2. Physiology . an increase in the response to a stimulus owing to the activation of additional receptors, resulting from the continuous application of the stimulus with the same intensity.