to apportion or assign (something); = allocate (1)
A distinguished post was allotted to ‘ancient sirloin’, as mine host termed it — Washington Irving
Each hour had its allotted task — Charlotte Brontë
to earmark or designate (something)
Ten minutes have been allotted for your speech
allotter noun
[Middle English alotten from early French aloter to share out by drawing lots, from ad- + lot lot, of Germanic origin; related to Old English hlot lot1]