An auto-antonym is a word that can mean the opposite of itself, and wan qualifies as an auto-antonym. Nowadays it mostly means "pale" or "sallow," but the first definition in the OED is "Lacking light, or lustre; dark-hued, dusky, gloomy, dark." It comes from Old English wann = "dark, gloomy, black." Because "pale" and "dark" are opposites, wan is an auto-antonym.
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