billionth
/ˈbɪl.i.ənθ/
"billionth" is a 9-letter English headword indexed on PlainSpell.
The verdict
“billionth” is uncommon English (frequency #65,731 among 4,121 “B” headwords), classed as an adjective. The kind of spelling people second-guess.
- #65,731
- frequency rank, English
- 4,121
- “B” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - The ordinal form of the number one billion.
Corpus desk
Index EN-billionth · billionth · English
billionth · rank #65,731 · 0 variants · 0 confusables
- FREQ-RARE #65,731
- LEN-LONG 9 letters
- VOW-3 3 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 4,121
- PHOTO-FINISH bilirubin
Nearest frequency peer: bilirubin (-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.
Long-tail ranks near “billionth”
Sparse band: bars invert rank so rarer forms read shorter
- Besson
Besson
34,273 corpus weight
- biked
biked
34,272 corpus weight
- bilirubin
bilirubin
34,271 corpus weight
- billionth
billionth
34,270 corpus weight
- bioenergy
bioenergy
34,269 corpus weight
- biomedicine
biomedicine
34,268 corpus weight
What this shows Long-tail view: where “billionth” sits against similarly uncommon English ranks.
| Property | Value |
|---|---|
| Headword | billionth |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˈbɪl.i.ənθ/ |
| Letters | 9 |
| Frequency rank | #65,731 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Long-tail rank of “billionth” in English
Rare enough to double-check
billionth is uncommon English at frequency #65,731 among 4,121 “B” headwords, classed as anadjective, transcribed /ˈbɪl.i.ənθ/. Rarity is why readers land here mid-draft. Gloss: "The ordinal form of the number one billion.".
Our edit-distance generator produced no likely misspellings for billionth, a straightforward case of a spelling with little room for common typos. Our dataset records no confusable match here, suggesting its spelling stands apart enough that readers rarely confuse it with something else.
Etymologically, the entry records: From billion + -th (ordinal suffix). The correct English form is billionth, spelled B-I-L-L-I-O-N-T-H.
Definition
- 1The ordinal form of the number one billion.
Etymology
From billion + -th (ordinal suffix).
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
How do you spell "billionth"?
What does "billionth" mean?
How do you pronounce "billionth"?
What is the origin of the word "billionth"?
Is PlainSpell free to use?
Similar English words by spelling shape
Same letter count and similar misspelling depth for "billionth", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 9 letters (nearest by frequency rank).