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.
A CDI, or Capacitor Discharged Ignition is a system that is linked to the ignition of some petrol engine driven vehicles.Its purpose is to store an electrical charge that is discharged through the ignition coil and thus increases the power to the spark plug/s for a very powerful, high-energy spark.This prevents fouling of the spark plug/s.A CDI can be disconnected in some vehicles and the engine would still run, but with a less powerful spark to the spark plug/s.his prevents fouling of the spark plug/s. A CDI can be disconnected in some vehicles and the engine would still run, but with a less powerful spark to the spark plug/s.