thirtieth
/ˈθɜːti.əθ/
"thirtieth" is a 9-letter English headword indexed on PlainSpell.
The verdict
“thirtieth” is uncommon English (frequency #54,533 among 3,151 “T” headwords), classed as an adjective. The kind of spelling people second-guess.
- #54,533
- frequency rank, English
- 3,151
- “T” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The ordinal form of the number thirty.
Corpus desk
Index EN-thirtieth · thirtieth · English
thirtieth · rank #54,533 · 0 variants · 0 confusables
- FREQ-RARE #54,533
- LEN-LONG 9 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 3,151
- PHOTO-FINISH torr
Nearest frequency peer: torr (+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.
Long-tail ranks near “thirtieth”
Sparse band: bars invert rank so rarer forms read shorter
- testable
testable
45,473 corpus weight
- tetracycline
tetracycline
45,472 corpus weight
- tew
tew
45,471 corpus weight
- thirtieth
thirtieth
45,468 corpus weight
- torr
torr
45,466 corpus weight
- Trang
Trang
45,464 corpus weight
What this shows Long-tail view: where “thirtieth” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | thirtieth |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˈθɜːti.əθ/ |
| Letters | 9 |
| Frequency rank | #54,533 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “thirtieth” in English
Rare enough to double-check
thirtieth is uncommon English at frequency #54,533 among 3,151 “T” headwords, classed as anadjective, transcribed /ˈθɜːti.əθ/. Rarity is why readers land here mid-draft. Gloss: "The ordinal form of the number thirty.".
Our edit-distance generator produced no likely misspellings for thirtieth, since its letter sequence doesn't invite the usual edit-distance slips. This entry stands alone in our confusable dataset, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: From earlier thirteth, from Middle English thrittithe, threttiþe, thrittyde, from Old English þrītigoþa; equivalent to thirty + -eth. For the modern form, see the etymological notes at twentieth. The correct English form is thirtieth, spelled T-H-I-R-T-I-E-T-H.
Definition
- 1The ordinal form of the number thirty.
Etymology
From earlier thirteth, from Middle English thrittithe, threttiþe, thrittyde, from Old English þrītigoþa; equivalent to thirty + -eth. For the modern form, see the etymological notes at twentieth.
Synonyms
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); 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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "thirtieth", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 9 letters (nearest by frequency rank).