R0
/ɑɹˈnɔt/
"r0" is a 1-letter English headword indexed on PlainSpell.
The verdict
“R0” is an uncommon English word, ranked #78,978 in English word frequency and used as a noun.
- #78,978
- frequency rank, English
- 2
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - R₀ (“basic reproductive rate”)
| Property | Value |
|---|---|
| Headword | R0 |
| Language | English |
| Part of speech | Noun |
| IPA | /ɑɹˈnɔt/ |
| Letters | 2 |
| Frequency rank | #78,978 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “R0” sits in English frequency
Spelling & Dictionary Insight
The English entry for R0 is 2 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ɑɹˈnɔt/. Corpus data places it at rank #78,978 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. The dominant gloss from Wiktionary reads: "R₀ (“basic reproductive rate”)".
The misspelling generator found no plausible variants for R0, and the word's spelling is regular enough that our generator found nothing worth flagging. No close-neighbour confusable shows up for this headword in our dataset, since nothing in our dataset looks or sounds close enough to cause mix-ups.
This entry's etymology isn't recorded, so its spelling is best read as a straightforward mapping from sound to letter. The correct English form is R0, spelled R-0.
Definition
- 1R₀ (“basic reproductive rate”)
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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Using “R0”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is R-0 - every other letter order is a misspelling in standard orthography.
- Say it as /ɑɹˈnɔt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.