# tesseract

> English word · Noun · IPA /ˈte-sə-ˌrakt/ · frequency rank #61,153

## Definitions
1. The four-dimensional analogue of a cube; a 4D polytope bounded by eight cubes (analogously to the way a cube is bounded by six squares).
2. Any of various fictional mechanisms that explain extradimensional, superluminal, or time travel outside the geometry of the physical universe.

## Etymology
From tessara- (“four-”) + Ancient Greek ἀκτίς (aktís, “ray”).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/tesseract