[fi.del.i.ty] n, pl -ties [ME fidelite, fr. MF fidelite, fr. L fidelitat-, fidelitas, fr. fidelis faithful, fr. fides faith, fr. fidere to trust--more at bide] (15c) 1 a: the quality or state of being faithful b: accuracy in details: exactness
2: the degree to which an electronic device (as a record player, radio, or television) accurately reproduces its effect (as sound or picture) syn fidelity, allegiance, fealty, loyalty, devotion, piety mean faithfulness to something to which one is bound by pledge or duty. fidelity implies strict and continuing faithfulness to an obligation, trust, or duty "marital fidelity". allegiance suggests an adherence like that of citizens to their country "pledging allegiance". fealty implies a fidelity acknowledged by the individual and as compelling as a sworn vow "fealty to the truth". loyalty implies a faithfulness that is steadfast in the face of any temptation to renounce, desert, or betray "valued the loyalty of his friends". devotion stresses zeal and service amounting to self-dedication "a painter's devotion to her art". piety stresses fidelity to obligations regarded as natural and fundamental "filial piety".