tianPronunciation: /tjɑ̃/Definition of tian noun (plural pronunc. same) a dish of sliced vegetables cooked in olive oil and then layered in a dish and baked au gratin. a large oval earthenware cooking pot traditionally used in Provence. Origin:Provençal, based on Greek tēganon 'frying pan'tian in other Oxford dictionaries Definition of tian in the US English dictionary