1.NounA sticky, black to brown and highly viscous liquid or semi-solid, composed almost entirely of bitumen with small mineral particles, that is present in most crude petroleums and in some natural deposits.
"The mining of asphalt was big business in this area in the early twentieth century."
2.NounEllipsis of asphalt concrete, a hard ground covering used for roads and walkways.
"Please hose off the asphalt near the top of the driveway if the trucks get lots of mud on it."