The term “geometry” comes from the Greek word “γεωμετρία” (geometria), which means “measurement of the earth.” It is derived from “γῆ” (ge), meaning “earth,” and “μετρία” (metria), meaning “measurement.”

### 1. Proto-Indo-European (PIE)

The PIE root “*gē-” or “*gʷe-” means “earth,” and the root “*meh₁-” means “to measure.”

### 2. Ancient Greek (c. 8th century BCE)

From the PIE roots, the Ancient Greek word “γεωμετρία” (geometria) developed, composed of “γῆ” (ge), meaning “earth,” and “μετρία” (metria), meaning “measurement.” It referred to the mathematical discipline concerned with the properties and relations of points, lines, surfaces, and solids.

### 3. Latin

The Greek “γεωμετρία” was adopted into Latin as “geometria,” retaining the same meaning.

### 4. Old French (c. 9th to 14th century CE)

The Latin “geometria” evolved into Old French “géométrie,” retaining the meanings related to the mathematical discipline.

### 5. Middle English (c. 11th to 15th century CE)

The Old French “géométrie” was adopted into Middle English as “geometrie,” meaning the branch of mathematics dealing with shapes, sizes, and the properties of space.

### 6. Modern English (from 15th century CE to present)

The term “geometry” evolved into its current form and pronunciation, referring to the branch of mathematics that studies the properties and relations of points, lines, surfaces, and solids.

The word “geometry” reflects the mathematical study of spatial properties and relationships, foundational to fields such as mathematics, engineering, architecture, and various sciences.