1. the quality of being enduring and free from change or variation

- early mariners relied on the constancy of the trade winds

Similar word(s): stability

Definition categories: attribute, changelessness, unchangeability, unchangeableness, unchangingness

2. (psychology) the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation

Definition categories: thought, perception

3. faithfulness and dependability in personal attachments (especially sexual fidelity)

Definition categories: attribute, faithfulness, fidelity