The primary headword, an adjective, appears in Plato's discussion of the tyrant (who is the same as the intemperate person having political power) and the soul ruling over him: the appetitive soul, which is described by Plato as being 'a beast of many kinds or forms' (Republic 612A, web address 1).
[1] Likewise or similarly in other lexica; references at Photius pi1038 Theodoridis.
[2] The noun is used by Plato, Republic 580D-E, in his discussion of the types of pleasure corresponding to the three parts of the soul (web address 2). The third type of pleasure, belonging to the appetitive part of the soul, is of many kinds and there is no special name for it.
[3] This word makes reference to things that differ in various ways: the diversity of colors or stars, for example (see Plato, Phaedo 110D; Republic 529D).