What is 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 called?

nicety — 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. (Webster's 1913.)