|n.||1.||(Bot.) One of several species of poplar bearing this name, especially the Populus tremula, so called from the trembling of its leaves, which move with the slightest impulse of the air.|
|a.||1.||Of or pertaining to the aspen, or resembling it; made of aspen wood.|
|Noun||1.||aspen - any of several trees of the genus Populus having leaves on flattened stalks so that they flutter in the lightest wind|
|(language)||ASPEN - A toy language for teaching compiler
["ASPEN Language Specifications", T.R. Wilcox, SIGPLAN Notices 12(11):70-87, Nov 1977].