FIDELITY By N., Pam M.S. - May 11, 2013 1. the faithfulness of one person to another, a group or a belief. 2. The degree of accuracy of a instrument that will measure a particular property. FIDELITY: "Joe and Lyn practice fidelity to each other." Related Psychology Terms EIKONOMETER TESTAMENTARY CAPACITY LOYALTY CONTINUOUS RATING SCALE STEREOTYPE ACCURACY SURPRISINGNESS DIFFERENTIAL ACCURACY INTERPERSONAL TRUST SPEED-ACCURACY TRADEOFF MORALE Cite this page: N., Pam M.S., "FIDELITY," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/fidelity/ (accessed March 16, 2019).