## tesseract

noun

A four-dimensional hypercube.

Origin of tesseract

Greek*tessera*, neuter pl. of

*tesseres*,

*four*; see

**tessera**+

*aktīs*,

*ray of light*; see

**actino–**.

**tesseract**

represented in two dimensions

## tesseract

Noun

(*plural* tesseracts)

- (mathematics) The four-dimensional analogue of a cube; a 4D polytope bounded by eight cubes (in the same way a cube is bounded by six squares).
- (science fiction) Any of various fictional mechanisms that explain extradimensional, superluminal, or time travel outside the geometry of the physical universe.

Origin

From *tessara-* (“four-”) + Ancient Greek *ἀκτίς* (aktis, “ray”).