Definition from Wiktionary, the free dictionary
nicety (plural niceties)
- A small detail that is nice or polite to have but isn't necessary.
- We met the new captain while we were taking enemy fire and were unable to observe the niceties of formal introductions.
- Subtlety or precision of use.
- A rocket propelled grenade doesn't have the nicety of a sniper round, but you must admit its effectiveness.
Derived terms 
subtlety or precision of use
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