authority/ ɔː'θɔrɪtɪ /

1.noun [u] 
(power) 权威

He had an air of authority.
他有一种权威的姿态。
2.noun [u] 
(right,permission) 许可

The bank closed my account without my authority.
银行未经我的许可就结了我的账户。
3.noun
an authority on sth (expert) 某方面的权威

She's a world authority on heart disease.
她是位心脏病方面的世界级权威。
4.noun [c] 
(government body,ruling body) 当局

the local authority
地方当局
to have the authority to do sth
具有做某事的权力