3 Definitions

The projection of future demand, normally to supply the independent portion of demand such as customer or interplant orders, based on past history and known market changes. The prime driver for systems that manufacture items to stock, instead of to order.
defined by Lean Affiliates
The prediction of demand over a given time period based on input from Sales and Marketing, and historical trends
defined by Lean Kaizen
Estimate or prediction of future conditions and events based on information and knowledge available at the time of the estimate.
defined by PCoE Oregon .Gov