rational number
"rational-number" is a 14-letter English headword indexed on PlainSpell.
The verdict
“rational number” is outside the top-ranked English vocabulary, used as a noun - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 15
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A number that can be expressed as the ratio of two integers.
| Property | Value |
|---|---|
| Headword | rational number |
| Language | English |
| Part of speech | Noun |
| Letters | 15 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “rational number” sits in English frequency
Spelling & Dictionary Insight
The English entry for rational number is 15 letters long, classified as a noun. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "A number that can be expressed as the ratio of two integers.".
rational number has no tracked misspelling variants, since its letter sequence doesn't invite the usual edit-distance slips. We don't track a confusable pairing for this entry, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: From rational + number, ultimately from Latin rationalis + numerus. Compare analogous logarithm, from Ancient Greek. The correct English form is rational number, spelled R-A-T-I-O-N-A-L- -N-U-M-B-E-R.
Definition
- 1A number that can be expressed as the ratio of two integers.
Etymology
From rational + number, ultimately from Latin rationalis + numerus. Compare analogous logarithm, from Ancient Greek.
Antonyms
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). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “rational number”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is R-A-T-I-O-N-A-L- -N-U-M-B-E-R - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
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.