Definition of allowance for English Language Learners. : 1  an amount of money that is given to someone regularly or for a specific purpose. : 2  a small amount of money that is regularly given to children by their parents. : 3  an amount of something (such as time) that is allowed or available.
category development index (CDI) Category development index (CDI) is an index that is calculated by taking the percentage of a product categoryâs total sales that occur in a given market area as compared to the percentage of the total population in the market.
The Messaging Application Program Interface (MAPI) defines a set of properties that are independent of Microsoft Exchange. The CDO libraries define 32-bit type library constants for these predefined MAPI properties. For more information, see MAPI Property Tags.