rationalism

/ˈɹæʃ(ə)nəlɪzəm/

//ˈɹæʃ(ə)nəlɪzəm// noun

By · According to Wiktionary data (CC BY-SA) ·

"rationalism" is a 11-letter English headword indexed on PlainSpell.

The verdict

“rationalism” has 16 generated spelling variants in the English index at frequency #47,287. The variants make it a useful spelling check.

#47,287
frequency rank, English
3,094
“R” headwords
16
tracked misspellings
3
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The theory that reason is a source of knowledge independent of and superior to sense perception.

Corpus desk

Index EN-rationalism · rationalism · English

rationalism · rank #47,287 · 16 variants · 3 confusables

  • FREQ-MID #47,287
  • LEN-MEGA 11 letters
  • VOW-5 5 vowels
  • CONFUS-LOW 3 pairs
  • VAR-HIGH 16 variants
  • BOOK-MID 3,094
  • PHOTO-FINISH rebut

Nearest frequency peer: rebut (+2 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Rank peers near misspelling magnet “rationalism”

Same rarity band: useful when a typo lands on a peer headword

corpus weight

What this shows “rationalism” sits among these FrequencyWords peers; misspelling depth is tracked separately in the edit-distance chart.

Source FrequencyWords open word-frequency list As of September 3, 2026

Visual similarity to commonly confused words

How many letter changes separate each confused pair (Levenshtein distance, normalized).

rationalism vs rationality
82% similar
rationalism vs rationalize
82% similar
rationalism vs rationalist
91% similar

Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).

Key facts for rationalism
PropertyValue
Headwordrationalism
LanguageEnglish
Part of speechNoun
IPA/ˈɹæʃ(ə)nəlɪzəm/
Letters11
Frequency rank#47,287
Misspellings tracked16
Confusable pairs3
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “rationalism”

Word frequency stretches from the small set of words we reach for constantly (left) out to the long tail barely used once in a while (right).rationalismlands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Same rarity band neighbours include “rebut” (#47,289), “rabat” (#47,284), “quietest” (#47,282). Among 3,094 “R” headwords, “rationalism” is #47,287. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 16 spelling variants around rationalism (IPA /ˈɹæʃ(ə)nəlɪzəm/), anoun. Corpus frequency is #47,287 among 3,094 “R” headwords. Wiktionary lists 4 senses, so context still picks the gloss.

Our generated misspelling index lists 16 likely wrong-spelling variants for rationalism, with forms such as "artionalism", "raitonalism", and "ratinoalism". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 3 confusable-pair relationships, "rationality", "rationalize", "rationalist", where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From rational + -ism. The correct English form is rationalism, spelled R-A-T-I-O-N-A-L-I-S-M.

Definition

  1. 1
    The theory that reason is a source of knowledge independent of and superior to sense perception.
  2. 2
    The theory that knowledge may be derived by deductions from a priori concepts (such as axioms, postulates or earlier deductions).
  3. 3
    A view that the fundamental method for problem solving is through reason and experience rather than faith, inspiration, revelation, intuition or authority.
  4. 4
    Elaboration of theories by use of reason alone without appeal to experience, such as in mathematical systems.

Recorded use

Wiktionary example

These source excerpts show how rationalism appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. The opinion opposed to mysticism in philosophy is sometimes spoken of as rationalism. Rationalism insists that all our beliefs ought ultimately to find for themselves articulate grounds. Such grounds, for rationalism, must consist of four things: (1) definitely statable abstract principles; (2) definite facts of sensation; (3) definite hypotheses based on…

Etymology

From rational + -ism.

Synonyms

apriorismintellectualism

Antonyms

sensationalismirrationalismtraditionalismmysticism

This word in other languages

racionalismo(Español)rationalisme(Français)Rationalismus(Deutsch)

Common misspellings

Also misspelled as:

  • artionalism
  • raitonalism
  • ratinoalism
  • ratioanlism
  • rationailsm
  • rationalims
  • rationalismm
  • rationalissm
  • rationallism
  • rationalsim
  • rationlaism
  • rationnalism
  • ratoinalism
  • rattionalism
  • rrationalism
  • rtaionalism

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of rationalism - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.

artionalism2raitonalism2ratinoalism2ratioanlism2rationailsm2rationalims2rationalismm1rationalissm1
Edit distance from "rationalism"

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

How do you spell "rationalism"?
"rationalism" is spelled R-A-T-I-O-N-A-L-I-S-M. The IPA pronunciation is /ˈɹæʃ(ə)nəlɪzəm/.
What does "rationalism" mean?
As a noun, "rationalism" means: The theory that reason is a source of knowledge independent of and superior to sense perception.
What words are commonly confused with "rationalism"?
"rationalism" is commonly confused with "rationality", "rationalize", "rationalist". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "rationalism"?
The IPA (International Phonetic Alphabet) transcription for "rationalism" is /ˈɹæʃ(ə)nəlɪzəm/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "rationalism"?
From rational + -ism. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "rationalism", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 11 letters (nearest by frequency rank).

polypeptide#47,268Rittenhouse#47,309phosphatase#47,255sociopathic#47,342

Similar misspelling depth

Headwords with a similar count of attested misspellings (16 here; floor ≥5).

restocking16 variantsspeedometer16 variantssurfactant16 variantssweltering16 variants

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list