a subtle difference or distinction in expression, meaning, response, etc.
2.
a very slight difference or variation in color or tone.
Origin: 1775–85; < French: shade, hue, equivalent to nu(er) to shade (literally, to cloud < Vulgar Latin*nūbāre, derivative of *nūba, for Latinnūbēs cloud) + -ance-ance
1781, from Fr. nuance "slight difference, shade of color," from nuer "to shade," from nue "cloud," from Gallo-Romance *nuba, from L. nubes "cloud;" related to obnubere "to veil," from PIE *sneudh- "fog" (cf. Avestan snaoda "clouds," Welsh nudd "fog," Gk. nython, in Hesychius "dark, dusky").