thirty

/ˈθɜːti/

//ˈθɜːti// num

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

"thirty" is a 6-letter English headword indexed on PlainSpell.

The verdict

“thirty” has 10 generated spelling variants in the English index at frequency #3,791. The variants make it a useful spelling check.

#3,791
frequency rank, English
3,151
“T” headwords
10
tracked misspellings
11
confusable pairs

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.

Corpus desk

Index EN-thirty · thirty · English

thirty · rank #3,791 · 10 variants · 11 confusables

  • FREQ-COMMON #3,791
  • LEN-LONG 6 letters
  • VOW-2 2 vowels
  • CONFUS-MID 11 pairs
  • VAR-MID 10 variants
  • BOOK-MID 3,151
  • PHOTO-FINISH suitable

Nearest frequency peer: suitable (-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 “thirty”

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

corpus weight

What this shows “thirty” 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).

thirty vs titty
67% similar
thirty vs thorny
67% similar
thirty vs twisty
67% similar

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

Key facts for thirty
PropertyValue
Headwordthirty
LanguageEnglish
Part of speechNumeral
IPA/ˈθɜːti/
Letters6
Frequency rank#3,791
Misspellings tracked10
Confusable pairs11
SourceWiktionary (kaikki.org)

Frequency seat of misspelling magnet “thirty”

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).thirtylands here:

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

Scale is logarithmic (each tick is 10× rarer). Same rarity band neighbours include “suitable” (#3,790), “valid” (#3,792), “sucks” (#3,789). Among 3,151 “T” headwords, “thirty” is #3,791. Source: FrequencyWords open word-frequency list.

A misspelling magnet

The generator records 10 spelling variants around thirty (IPA /ˈθɜːti/), anumeral. Corpus frequency is #3,791 among 3,151 “T” headwords. Dominant gloss: "The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.".

Our generated misspelling index lists 10 likely wrong-spelling variants for thirty, with forms such as "htirty", "thhirty", and "thirrty". 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 11 confusable-pair relationships, "titty", "thorny", "twisty", and more, a pairing that trips writers up because the two words share enough sound or shape to blur together.

Etymologically, the entry records: From Middle English thirty, metathetic alternant of Middle English thriti, þrittiȝ, from Old English þrītiġ (“thirty”), from Proto-Germanic *þrīz tigiwiz (“thirty”, literally “three tens”), equivalent to three + -ty. Cognate with Scots therty, tretty (“thir… The correct English form is thirty, spelled T-H-I-R-T-Y.

Definition

  1. 1
    The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.

Recorded use

Wiktionary example

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

  1. To conclude, here in tabular form is a summary of our ratings of espressos produced from thirty pod, capsule and disc blends.

Etymology

From Middle English thirty, metathetic alternant of Middle English thriti, þrittiȝ, from Old English þrītiġ (“thirty”), from Proto-Germanic *þrīz tigiwiz (“thirty”, literally “three tens”), equivalent to three + -ty. Cognate with Scots therty, tretty (“thirty”), West Frisian tritich (“thirty”), Dutch dertig (“thirty”), German dreißig (“thirty”).

This word in other languages

treinta(Español)trente(Français)dreißig(Deutsch)trinta(Português)

Common misspellings

Also misspelled as:

  • htirty
  • thhirty
  • thirrty
  • thirtty
  • thirtyy
  • thiryt
  • thitry
  • thrity
  • tihrty
  • tthirty

Misspelling Pattern Breakdown

How far each generated variant is from the correct spelling of thirty - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.

htirty2thhirty1thirrty1thirtty1thirtyy1thiryt2thitry2thrity2
Edit distance from "thirty"

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 "thirty"?
"thirty" is spelled T-H-I-R-T-Y. The IPA pronunciation is /ˈθɜːti/.
What does "thirty" mean?
As a numeral, "thirty" means: The cardinal number occurring after twenty-nine and before thirty-one, represented in Arabic numerals as 30.
What words are commonly confused with "thirty"?
"thirty" is commonly confused with "titty", "thorny", "twisty". These words look or sound similar but have different meanings. PlainSpell provides detailed comparisons for each pair.
How do you pronounce "thirty"?
The IPA (International Phonetic Alphabet) transcription for "thirty" is /ˈθɜːti/. 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 "thirty"?
From Middle English thirty, metathetic alternant of Middle English thriti, þrittiȝ, from Old English þrītiġ (“thirty”), from Proto-Germanic *þrīz tigiwiz (“thirty”, literally “three tens”), equivalent to three + -ty. Cognate with Scots therty, tre... 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 "thirty", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 6 letters (nearest by frequency rank).

whilst#3,794shaped#3,784Oxford#3,772Gordon#3,813

Similar misspelling depth

Headwords with a similar count of attested misspellings (10 here; floor ≥5).

Atlanta10 variantscommerce10 variantsfuneral10 variantsoccasion10 variants

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

Source: FrequencyWords open word-frequency list