proxy

noun
UK /ˈprɒksi/
US /ˈprɑːksi/

A proxy is a person or thing that stands in for someone else.

My sister acted as a proxy and voted for me at the meeting.


OTHER MEANINGS

2. A computer server that passes requests between a user and the internet.

The school network uses a proxy to filter websites.

3. A document that gives someone the power to act for another person.

She signed a proxy so her lawyer could attend the meeting.

4. A way to measure something indirectly.

Test scores are often used as a proxy for school quality.