1. (

• constancy ,
• stability ,

) the quality of being enduring and free from change or variation; "early mariners relied on the constancy of the trade winds" ;

2. (

• constancy ,
• perceptual_constancy

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

3. (

• constancy ,

) faithfulness and dependability in personal attachments (especially sexual fidelity) ;