cascadianEtymologyFrom Cascadia + -ian.adjOf, pertaining to, or characteristic of the Cascadia region of North America.“All the evidence, starting with the layer of sand, points to a Cascadian earthquake during the night of January 26, potentially as big as the Sumatran one of 2004.”nounA resident of the Cascadia bioregion of North America.“Cascadians gathered enough political strength in Congress to defeat proposed border-crossing fees, and they got approval for dedicated commuter lanes and smart cards to speed transit at the Peace Arch crossing.”