A dimension is a measurable side or aspect of something, such as length, width, and height in space. More generally, it can mean an important feature or quality of a situation or idea.
From Latin "dimensio" meaning "a measuring," from "dimetiri" (to measure out), formed from "di-" (apart) and "metiri" (to measure). It entered English through French in the late Middle Ages.
In math and physics, each dimension is like a direction you can move independently—forward/back, left/right, up/down, and even through time. When people say "another dimension" in everyday talk, they’re borrowing this idea of a whole extra way reality could be arranged.
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