ascertain

/ˌæsəˈteɪn/

//ˌæsəˈteɪn// verb

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

"ascertain" is a 9-letter English headword indexed on PlainSpell.

The verdict

“ascertain” has 13 generated spelling variants in the English index at frequency #19,760. The variants make it a useful spelling check.

#19,760
frequency rank, English
3,931
“A” headwords
13
tracked misspellings
1
confusable pair

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - To find out definitely; to discover or establish.

Corpus desk

Index EN-ascertain · ascertain · English

ascertain · rank #19,760 · 13 variants · 1 confusable

  • FREQ-MID #19,760
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-LOW 1 pairs
  • VAR-HIGH 13 variants
  • BOOK-MID 3,931
  • PHOTO-FINISH arrays

Nearest frequency peer: arrays (-1 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 “ascertain”

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

corpus weight

What this shows “ascertain” 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).

ascertain vs ascertained
82% similar

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

Key facts for ascertain
PropertyValue
Headwordascertain
LanguageEnglish
Part of speechVerb
IPA/ˌæsəˈteɪn/
Letters9
Frequency rank#19,760
Misspellings tracked13
Confusable pairs1
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “ascertain”

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).ascertainlands here:

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “arrays” (#19,759), “Assam” (#19,761), “audits” (#19,762). Among 3,931 “A” headwords, “ascertain” is #19,760. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 13 spelling variants around ascertain (IPA /ˌæsəˈteɪn/), averb. Corpus frequency is #19,760 among 3,931 “A” headwords. Wiktionary lists 5 senses, so context still picks the gloss.

Our generated misspelling index lists 13 likely wrong-spelling variants for ascertain, with forms such as "acsertain", "asccertain", and "asceratin". Each variant is a distinct typo pattern an edit-distance generator flags, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution. It also participates in 1 confusable-pair relationship, "ascertained", since the words sound or look close enough that writers reach for the wrong one mid-sentence.

Etymologically, the entry records: From Middle English acerteynen, from Old French acertener, from a- (“to, towards”) + certener (“make sure of”), from the adjective certain, from Latin certus (“certain, fixed”). Compare to Spanish acertar. The correct English form is ascertain, spelled A-S-C-E-R-T-A-I-N.

Definition

  1. 1
    To find out definitely; to discover or establish.
  2. 2
    To make (someone) certain or confident about something; to inform.
  3. 3
    To look for something lost.
  4. 4
    To establish, to prove.
  5. 5
    To ensure or effect.

Recorded use

Wiktionary examples

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

  1. As soon as we ascertain what the situation is, we can plan how to proceed.
  2. “There the cause of death was soon ascertained ; the victim of this daring outrage had been stabbed to death from ear to ear with a long, sharp instrument, in shape like an antique stiletto, which […] was subsequently found under the cushions of the hansom.[…]”

Etymology

From Middle English acerteynen, from Old French acertener, from a- (“to, towards”) + certener (“make sure of”), from the adjective certain, from Latin certus (“certain, fixed”). Compare to Spanish acertar.

This word in other languages

averiguar(Español)constater(Français)feststellen(Deutsch)averiguar(Português)

Common misspellings

Also misspelled as:

  • acsertain
  • asccertain
  • asceratin
  • ascerrtain
  • ascertainn
  • ascertani
  • ascertian
  • ascerttain
  • ascetrain
  • ascretain
  • asecrtain
  • asscertain
  • sacertain

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of ascertain - measured in single-character edits (insert, delete, or substitute a letter). Larger bars are easier to catch; one-edit slips are the sneakiest.

acsertain2asccertain1asceratin2ascerrtain1ascertainn1ascertani2ascertian2ascerttain1
Edit distance from "ascertain"

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 "ascertain"?
"ascertain" is spelled A-S-C-E-R-T-A-I-N. The IPA pronunciation is /ˌæsəˈteɪn/.
What does "ascertain" mean?
As a verb, "ascertain" means: To find out definitely; to discover or establish.
What words are commonly confused with "ascertain"?
"ascertain" is commonly confused with "ascertained". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "ascertain"?
The IPA (International Phonetic Alphabet) transcription for "ascertain" is /ˌæsəˈteɪn/. 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 "ascertain"?
From Middle English acerteynen, from Old French acertener, from a- (“to, towards”) + certener (“make sure of”), from the adjective certain, from Latin certus (“certain, fixed”). Compare to Spanish acertar. 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 "ascertain", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 9 letters (nearest by frequency rank).

afflicted#19,753adversary#19,752bloodshed#19,769commuting#19,793

Similar misspelling depth

Headwords with a similar count of attested misspellings (13 here; floor ≥5).

corrective13 variantsdangling13 variantsdaredevil13 variantsstacking13 variants

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

Source: FrequencyWords open word-frequency list