the share or proportional part of a total that is required from, or is due or belongs to, a particular district, state, person, group, etc.

a proportional part or share of a fixed total amount or quantity.

the number or percentage of persons of a specified kind permitted to enroll in a college, join a club, immigrate to a country, etc.

noun

allocation , allotment , allowance , apportionment , assignment , bite , chunk , cut , division , divvy , end , lot , measure , meed , part , partage , percentage , piece , piece of action , proportion , quantum , ration , share , slice , split , dole , portion , divide , dividend , quantity