tesseract
/ˈte-sə-ˌrakt/
"tesseract" is a 9-letter English headword indexed on PlainSpell.
The verdict
“tesseract” is uncommon English (frequency #61,153 among 27,828 “T” headwords), classed as a noun. The kind of spelling people second-guess.
- #61,153
- frequency rank, English
- 27,828
- “T” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - 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).
| Property | Value |
|---|---|
| Headword | tesseract |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈte-sə-ˌrakt/ |
| Letters | 9 |
| Frequency rank | #61,153 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “tesseract” sits in English frequency
Rare enough to double-check
tesseract is uncommon English at frequency #61,153 among 27,828 “T” headwords, classed as anoun, transcribed /ˈte-sə-ˌrakt/. Rarity is why readers land here mid-draft. 2 senses are on record.
Our edit-distance generator produced no likely misspellings for tesseract, since its letter pattern doesn't lend itself to common typo substitutions. No confusable counterpart is on file for this word, which tends to mean the word is visually distinctive enough to stand on its own.
Etymologically, the entry records: From tessara- (“four-”) + Ancient Greek ἀκτίς (aktís, “ray”). The correct English form is tesseract, spelled T-E-S-S-E-R-A-C-T.
Definition
- 1The four-dimensional analogue of a cube; a 4D polytope bounded by eight cubes (analogously to the way a cube is bounded by six squares).
- 2Any 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”).
Synonyms
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “tesseract”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is T-E-S-S-E-R-A-C-T - every other letter order is a misspelling in standard orthography.
- Say it as /ˈte-sə-ˌrakt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.