1 A number or symbol multiplied with a variable or an unknown quantity in an algebraic term, as 4 in the term 4 x, or x in the term x (a &plus; b). 2  A numerical measure of a physical or chemical property that is constant for a system under specified conditions, such as the coefficient of friction.
Select a Geo Prizm Year. The 1997 Geo Prizm is essentially a repackaged version of the Toyota Corolla. The 1996 Geo Prizm is an entry-level compact car that was introduced in 1989. The 1995 Geo Prizm remains one of the most pragmatic cars on the market.
Eyeglasses History. The first vision aid, called a reading stone, was invented around 1000 AD. The reading stone was a glass sphere that was laid on top of the reading material to magnify the letters. The first wearable eye glasses were invented around 1284 in Italy. It is thought that Salvino D'Armate was their inventor.