wane Share definition Flag Child, infant, baby. Used in parts of Donegal and Northern Ireland. Probably come from "wee one". Also sometimes written as "wayne" or "wean". "The wanes are asleep." "Stop acting like a big wane." wane by CiaramcN November 15, 2006 0 0 Get merch Get the wane mug. Buy Now — $32.95 See more merch