Entry 1 sense Webster, 1913 Causeway /(ka̤z"wā̇)/ · Cause·way · IPA /ˈkɔːz.weɪ/ 01 n. A way or road raised above the natural level of the ground, serving as a dry passage over wet or marshy ground. 1. A way or road raised above the natural level of the ground, serving as a dry passage over wet or marshy ground. “But that broad causeway will direct your way.” — Dryden. “The other way Satan went down The causey to Hell-gate.” — Milton.