+**1d** (one-dimensional) refers to a system or object whose position can be described by a single coordinate. It represents existence along a sole axis, like movement confined to a [Line](/wiki/line). This fundamental concept is the simplest form of [Space](/wiki/space), possessing only length without width or depth.
+## See also
+- [2d](/wiki/2d)
+- [3d](/wiki/3d)
+- [Dimension](/wiki/dimension)
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