noun
constancy
KAHN-stuhn-see/ˈkɑːnstənsi/
Steadiness maintained over time.
The lighthouse's constancy is apparent through sunshine, rain, and strong winds.

Etymology
The image of standing firm became firmness of mind and character. Constancy extends that steadiness to faithful attachment or the quality of remaining unchanged.
In context
you learn object constancy you learn that people will come in your life and primarily they will stay there even though they have to go to work
More examples
- The constancy of the room's temperature protects the artwork.
- His constancy in friendship earns our trust.
- Even fierce criticism does not shake the constancy of her beliefs.
Forms
constancy
constant adjective — Remaining steady or unchanged over time.
Similar words
- steadiness
- Emphasizes stability or freedom from fluctuation, not necessarily loyalty.
- consistency
- Emphasizes agreement or uniformity across repeated actions or results.
- fidelity
- Specifically emphasizes loyalty to a person, promise, or belief.