noun
essence
ESS-uns/ˈesns/
The essential nature or defining quality of something.
Supporting someone at rest is the essence shared by all three seats.

Etymology
Latin essentia meant “being”: what something truly is, rather than how it happens to appear. This distinction underlies essence as the basic nature or defining quality of something.
In context
the true nature the true essence or more literally the center of something
More examples
- Trust is the essence of a lasting friendship.
- The film preserves the essence of the original novel.
- In essence, the proposal gives workers more control over their schedules.
Forms
essence · essences
essential adjective — Central to something's basic nature or character.