An example of geometry is the calculation of a triangle's angles.

## geometry

*pl.* -·tries

- the branch of mathematics that deals with points, lines, planes, and figures, and examines their properties, measurement, and mutual relations in space
- a book about geometry
- a specific system of geometry

Origin of geometry

Middle English*geometrie*; from Old French ; from Classical Latin

*geometria*; from Classical Greek

*ge?metria*; from

*ge?metrein*, to measure the earth ; from

*g?*, earth +

*metria*, measurement ; from

*metrein*, to measure: for Indo-European base, see meter

## geometry

noun

*pl.*

**ge·om·e·tries**

**a.**The mathematics of the properties, measurement, and relationships of points, lines, angles, surfaces, and solids.**b.**A system of geometry:*Euclidean geometry.***c.**A geometry restricted to a class of problems or objects:*solid geometry.***d.**A book on geometry.**a.**Configuration; arrangement.**b.**A surface shape.- A physical arrangement suggesting geometric forms or lines.

Origin of geometry

Middle English*geometrie*, from Old French, from Latin

*ge&omacron;metria*, from Greek

*ge&omacron;metria*, from

*ge&omacron;metrein*,

*to measure land*:

*ge&omacron;-*,

*geo-*+

*metron*,

*measure*; see

*m&emacron;-*

^{2}in Indo-European roots.

*Related Forms:*

**ge·om′e·tri′cian**,**ge·om′e·ter**noun

## geometry

(*countable and uncountable*, *plural* geometries)

- (mathematics, uncountable) the branch of mathematics dealing with spatial relationships
- (mathematics, countable) a type of geometry with particular properties
*spherical geometry*

- (countable) the spatial attributes of an object, etc.

From Old French *géométrie*, from Latin *geometria*, from Ancient Greek *γεωμετρία* (geometría, “geometry, land-survey”), from *γεωμετρέω* (geometréo, “to practice or to profess geometry, to measure, to survey land”), back-formation from *γεωμέτρης* (geométrēs, “land measurer”), from *γῆ* (gē, “earth, land, country”) + *μετρέω* (metréō, “to measure, to count”) or *-μετρία* (-metria, “measurement”), from *μέτρον* (metron, “a measure”).