Dictionary.net

• the proportional limitation of production or distribution of something (e.g. crude oil or natural gas) to some fractional part of the total capacity of each producer

2006 - WordNet 3.0
By Princeton University

• the proportional limitation of production or distribution of something (e.g. crude oil or natural gas) to some fractional part of the total capacity of each producer

2011 - English Dictionary Database
By DataStellar Co., Ltd