rationalise
/ˈɹæʃ.ə.nə.laɪz/
"rationalise" is a 11-letter English headword indexed on PlainSpell.
The verdict
“rationalise” is uncommon English (frequency #62,439 among 21,470 “R” headwords), classed as a verb. The kind of spelling people second-guess.
- #62,439
- frequency rank, English
- 21,470
- “R” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Non-Oxford British English standard spelling of rationalize.
| Property | Value |
|---|---|
| Headword | rationalise |
| Language | English |
| Part of speech | Verb |
| IPA | /ˈɹæʃ.ə.nə.laɪz/ |
| Letters | 11 |
| Frequency rank | #62,439 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “rationalise” sits in English frequency
Rare enough to double-check
rationalise is uncommon English at frequency #62,439 among 21,470 “R” headwords, classed as averb, transcribed /ˈɹæʃ.ə.nə.laɪz/. Rarity is why readers land here mid-draft. Gloss: "Non-Oxford British English standard spelling of rationalize.".
rationalise has no tracked misspelling variants, typically a sign the spelling maps closely to how the word sounds. This entry stands alone in our confusable dataset, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From French rationaliser. By surface analysis, rational + -ise. The correct English form is rationalise, spelled R-A-T-I-O-N-A-L-I-S-E.
Definition
- 1Non-Oxford British English standard spelling of rationalize.
Etymology
From French rationaliser. By surface analysis, rational + -ise.
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 “rationalise”
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-I-S-E - every other letter order is a misspelling in standard orthography.
- Say it as /ˈɹæʃ.ə.nə.laɪz/ (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.