noun
nicety
NY-suh-tee/ˈnaɪsəti/
A fine detail or subtle distinction.
Aligning the fork precisely is a small nicety of the formal table setting.

Etymology
Formed from an adjective meaning “silly,” nicety originally meant “foolishness.” As nice developed senses involving precision and care, nicety likewise came to mean a subtle point or exact detail.
In context
… not as a social nicety but as a clinical inquiry the way she had asked patients questions for 22 years expecting a real answer …
More examples
- The contract's legal niceties require a lawyer's careful review.
- We agree on the plan but still debate a few niceties.
- He observes the social niceties, including greeting everyone by name.
Forms
nicety · niceties