to permit (something, or somebody to do something)
Smoking is not allowed
to enable or make it possible for (somebody to do something)
The software allows you to copy from one application to another
to admit the possibility of (something)
The facts allow only one explanation
to fail to prevent (something, or somebody from doing something)
She had allowed herself to become angry
to assign (e.g. time or money) as a share or suitable amount
Allow an hour for lunch
to grant (a sum of money) as an allowance to (somebody)
They allowed him £500 a year
to reckon (an amount) as a deduction or an addition
Allow a gallon for leakage
(+ that) to admit (something) as true or valid; to acknowledge (something)
I allowed that I could have been wrong
(+ of) to admit the possibility of something
evidence that allows of only one conclusion
(+ for) to take (special factors or circumstances) into account
This figure allows for inflation