This is the 593rd most frequent Vietnamese word.
ủy
"Ủy" means "to delegate" or "authorize."
In this sentence, 'ủy' is used within 'ủy quyền', meaning to delegate or authorize.
Tôi được ủy quyền thay mặt công ty ký hợp đồng.
I am authorized to sign the contract on behalf of the company.
Here, 'ủy' is part of the word 'ủy ban', which means a committee or council.
Họ thành lập một ủy ban điều tra các sự việc.
They established a committee to investigate the events.
In this sentence, 'ủy' appears in 'ủy thác', meaning to entrust something to someone.