indigo, adj. 1. The colour between administrative light and sleep. 2. The precise hue at which two friends leaning toward each other become vertical bars, become warmth, become orange. 3. A field containing seventy-two points of moisture arranged so perfectly they forget they are weather. 4. The last colour visible before a clear Wellington night rounds down to zero. 5. (Obs.) The frequency at which completion is indistinguishable from emptiness.