See set-aside in Webster's New World College Dictionary
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noun
something set aside or reserved, as by the government, for a specific purpose, for the use or benefit of a particular group, etc.
See set-aside in American Heritage Dictionary 4
(sĕtˈə-sīdˌ)
noun
Something, such as land or a certain percentage of profits, that is set aside for a specific purpose.
A federal program requiring that a certain percentage of government funds and contracts be reserved for businesses owned by women and members of minority groups.