proxy
UK[ˈprɒk.si]US[ˈprɑːk.si]
n
A person who is given the authority to represent someone else and act on their behalf, especially in voting or other formal matters.
n
A document giving someone such authority.
n
A figure or measurement used to represent or approximate something else that is difficult to measure directly.
Etymology
The word 'proxy' embarked on a journey of phonetic contraction and semantic specialization. It originates from the Medieval Latin term 'procuratia', the office or authority of a 'procurator'—a manager or agent. This Latin term stems from 'procurare', meaning 'to take care of' or 'to manage', itself formed from 'pro-' (for, on behalf of) and 'curare' (to care for). Entering English in the 15th century as 'proccie', a clipped form of 'procuracy', it initially denoted the function or document of agency. Over time, 'proxy' crystallized to refer primarily to the person authorized to act for another, and later expanded metaphorically to describe any substitute or indirect measure representing a broader concept.
Analysis
The entire word 'proxy' functions as a simplex unit in modern English. It is a loanword from the Middle English 'proccie', which was a contraction of 'procuracy'. Its ultimate origin is the Medieval Latin word 'procuratia', meaning 'procuration' or 'management for another', derived from Latin 'procurare' (to take care of, manage).
Examples
Shareholders not attending the meeting can vote by proxy.
The lawyer held a signed proxy to make decisions for her client.
In their study, household income was used as a proxy for overall economic well-being.