A shift in the entire demand curve so that at any given price, people will want to buy a different amount. A change in demand is caused by some change other than a change in the goods price.
a change in the ENTIRE demand relation
A change in the quantity that people plan to buy when any influence on buying plans other than the price of the good changes. (p. 84)
see Demand decrease and Demand increase.
A change in demand is a change in consumers' willingness and ability to purchase products which occurs when some influence on those plans (other than the price of the product) changes. It is illustrated by a shift of the demand curve and by the creation of a new demand schedule. Contrast with change in the quantity demanded.
An increase or decrease in the quantities demanded over a range of prices. This is graphically depicted by a shift in the demand curve.