Word Origin & History
neat (adj.)
1542, "clean, free from dirt," from Anglo-Fr. neit, from O.Fr. net "clear, pure," from L. nitidus "well-favored, elegant, trim," lit. "gleaming," from nitere "to shine," from PIE base *nei-/*ni- "to shine" (cf. M.Ir. niam "gleam, splendor," niamda "shining;" O.Ir. noib "holy," niab "strength;" Welsh nwyfiant "gleam, splendor"). Meaning "inclined to be tidy" is from 1577. Sense of "straight liquor" is c.1800, from meaning "unadulterated" (of wine), first attested 1579. Informal sense of "very good" first recorded 1934 in Amer.Eng.; variant neato is teenager slang, first recorded 1968. Neatnik "excessively tidy person" is from 1959 (see -nik).