Wan"ion (?), n. [Probably for OE. waniand waning, p. pr. of wanien; hence, used of the waning of the moon, supposed to be an unlucky time. See Wane.]
A word of uncertain signification, used only in the phrase with a wanion, apparently equivalent to with a vengeance, with a plague, or with misfortune.
B. Jonson. Latimer.
© Webster 1913.