I. noun — [ mass noun] 1. (Symbol: Al) — the chemical element of atomic number 13, a light silvery-grey metal.Aluminium is the most abundant metal in the earth’s crust and is obtained mainly from bauxite. Its resistance to corrosion, lightness, and strength (especially in alloys) have led to widespread use in domestic utensils, engineering parts, and aircraft construction.
– origin early 19th cent.: from alumina + -ium.