English word origin

Etymology of pro

From Late Middle English pro, from Latin prō (“on behalf of”).

5 source sectionsExtended source reportWiktionary original ↗

In this entry · 5 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Source etymology 1

Original entry ↗

prep

In favor of.

noun

An advantage of something, especially when contrasted with its disadvantages (cons). · A person who supports a concept or principle.

Selected source glosses provide context, not a complete modern definition inventory

From Late Middle English pro, from Latin prō (“on behalf of”).

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

Inherited-form mentionproenm
Derivation mentionprōla

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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Source etymology 2

Original entry ↗

noun

A professional sportsman. · Professional.

adj

Professional.

Selected source glosses provide context, not a complete modern definition inventory

Clipping of professional.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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Source etymology 3

Original entry ↗

noun

A prostitute.

Selected source glosses provide context, not a complete modern definition inventory

Clipping of prostitute.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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Source etymology 4

Original entry ↗

noun

A proproctor.

Selected source glosses provide context, not a complete modern definition inventory

Clipping of proproctor.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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Source etymology 5

Original entry ↗

noun

A chemical prophylaxis taken after sex to avoid contracting venereal disease.

Selected source glosses provide context, not a complete modern definition inventory

Clipping of prophylaxis.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for pro →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger

Machine-source provenance

Source SHA-256: 5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run: 73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID: w-cHJv