FUNCTION By N., Pam M.S. - May 11, 2013 1. Use or purpose of a thing. 2. Biology. Action of an organism contributing to its fitness. 3. Mathematical procedure relating to quantity and a defined rule. FUNCTION: "A function is what we use something for, like a spades function is to dig." Related Psychology Terms TRANSFORMATION UTILITY MATHEMATICAL BIOLOGY ESTIMATOR UNFITNESS DRIVE STRENGTH OPERATIONAL ANALYSIS FISSION FITNESS ACHROMATIC INTERVAL Cite this page: N., Pam M.S., "FUNCTION," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/function/ (accessed March 16, 2019).