1. A clear space between a citadel and the nearest houses of the town. The glacis of the counterscarp, or the slope of the parapet of the covered way toward the country.
2. (Science: botany) a grass plat; a lawn.
3. Any clear, level space used for public walks or drives; especially, a terrace by the seaside.
Origin: f. Esplanade, sp. Esplanada, explanada, cf. It. Spianata; fr. Sp. Explanar to level, L. Explanare to flatten or spread out. See explain.