1. the quality of being faithful and unchanging in one’s feelings, beliefs, or behavior
2. the quality of staying the same; lack of change or variation

Examples

• Her constancy to her friends never wavered, even during difficult times.
• The constancy of his love gave her comfort throughout their marriage.
• Scientists rely on the constancy of physical laws in their experiments.
• The constancy of the temperature in the laboratory was crucial for accurate results.
• His constancy of purpose helped him achieve his long-term goals.
• The constancy of the ocean’s tides has fascinated humans for centuries.