Fidelity/fɪˈdeləti/ Definition 1 of 3Pro Tip 1/3Emotional Weight Fidelity carries a strong positive emotion and value in relationships or commitments. His fidelity to his childhood friend was deeply admired. Pro Tip 2/3Not Just Romantic Fidelity extends beyond romantic contexts to loyalty to ideals, groups, or nations. Her fidelity to the company's ethics was unquestionable. Pro Tip 3/3Cultural Sensitivity Concepts of fidelity may vary by culture, especially in expectations of loyalty. Many societies place a high importance on marital fidelity.