The Collaborative International Dictionary
To a nicety
Nicety \Ni"ce*ty\, n.; pl. Niceties. [OE. nicet['e] foolishness.]
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The quality or state of being nice (in any of the senses of that word.).
The miller smiled of her nicety.
--Chaucer. Delicacy or exactness of perception; minuteness of observation or of discrimination; precision.
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A delicate expression, act, mode of treatment, distinction, or the like; a minute distinction.
The fineness and niceties of words.
--Locke.To a nicety, with great exactness or accuracy.
Wiktionary
to a nicety
adv. (context idiomatic English) To a fine point, with great exactness or accuracy.