Use the adjective geometric to describe anything that's decorated with simple shapes and lines. The geometric design of your new wallpaper, with its repeated triangles, makes your room look really sophisticated.

In math, geometric refers to geometry — any calculations involving the angles of a polygon or the diameter of a circle are geometric. The Greek root is geometria, "measurement of earth or land." The math definition of geometric is its original meaning, dating to the early 17th century. It wasn't until 1900 that the adjective was first used to describe a design style — specifically, a type of Greek pottery decoration characterized by lines and angles.

Definitions of geometric
  1. adjective
    characterized by simple geometric forms in design and decoration
    “a buffalo hide painted with red and black geometric designs”
    synonyms: geometrical
    of or relating to a style of art in which objects do not resemble those known in physical nature
  2. adjective
    of or relating to or determined by geometry
    synonyms: geometrical
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