FITNESS By N., Pam M.S. - May 11, 2013 1. The set of attributes a person has that enables them to carry out daily tasks and perform physical work. 2. Biology. The ability of an organism to produce offspring. FITNESS: "Joe had sufficient fitness to work and exercise each day." Related Psychology Terms FECUNDITY UNFITNESS FUNCTIONAL STATUS SKILL BARTHEL INDEX MUTATION BORG SCALE CAPACITY REASONABLE ACCOMMODATIONS REPRODUCTIVE SUCCESS Cite this page: N., Pam M.S., "FITNESS," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/fitness/ (accessed June 15, 2019).