parenthesis
/pəˈɹɛnθəsɪs/
"parenthesis" is a 11-letter English headword indexed on PlainSpell.
The verdict
“parenthesis” is a moderately-common English word, ranked #45,571 in English word frequency and used as a noun.
- #45,571
- frequency rank, English
- 11
- letters
- 17
- tracked misspellings
- 1
- confusable pair
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A clause, phrase or word which is inserted (usually for explanation or amplification) into a passage which is already grammatically complete, and usually marked off with brackets, commas or dashes.
Visual similarity to commonly confused words
How many letter changes separate each confused pair (Levenshtein distance, normalized).
Source: PlainSpell confusable corpus (Wiktionary, CC BY-SA).
| Property | Value |
|---|---|
| Headword | parenthesis |
| Language | English |
| Part of speech | Noun |
| IPA | /pəˈɹɛnθəsɪs/ |
| Letters | 11 |
| Frequency rank | #45,571 |
| Misspellings tracked | 17 |
| Confusable pairs | 1 |
| Source | Wiktionary (kaikki.org) |
Where “parenthesis” sits in English frequency
Spelling & Dictionary Insight
The English entry for parenthesis is 11 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /pəˈɹɛnθəsɪs/. Corpus data places it at rank #45,571 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 4 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 17 likely wrong-spelling variants for parenthesis, with forms such as "aprenthesis", "paernthesis", and "parenhtesis". Each of these forms differs from the correct spelling by one small edit: a doubled letter, a dropped silent letter, or a substituted vowel. It also participates in 1 confusable-pair relationship, "parentheses", a pairing that trips writers up because the two words share enough sound or shape to blur together.
Etymologically, the entry records: Learned borrowing from Late Latin parenthesis (“addition of a letter to a syllable in a word”), itself borrowed from Ancient Greek παρένθεσις (parénthesis, “insertion”). By surface analysis, par- + en- + thesis. The correct English form is parenthesis, spelled P-A-R-E-N-T-H-E-S-I-S.
Definition
- 1A clause, phrase or word which is inserted (usually for explanation or amplification) into a passage which is already grammatically complete, and usually marked off with brackets, commas or dashes.
- 2Either of a pair of brackets, especially (mainly US) round brackets, ( and ) (used to enclose parenthetical material in a text).
- 3A digression; the use of such digressions.
- 4Such brackets as used to clarify expressions by grouping those terms affected by a common operator, or to enclose the components of a vector or the elements of a matrix.
Etymology
Learned borrowing from Late Latin parenthesis (“addition of a letter to a syllable in a word”), itself borrowed from Ancient Greek παρένθεσις (parénthesis, “insertion”). By surface analysis, par- + en- + thesis.
Synonyms
This word in other languages
Common misspellings
Also misspelled as: aprenthesis,paernthesis,parenhtesis,parennthesis,parentehsis,parentheiss,parenthesiss,parenthessi,parenthessis,parenthhesis,parenthseis,parentthesis,paretnhesis,parnethesis,parrenthesis,pparenthesis,praenthesis
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of parenthesis - counted as single-character edits (an insertion, a deletion, or a substituted letter). The larger the bar, the easier the typo is to spot; one-edit slips are the ones that sneak past readers.
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 "parenthesis"?
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Using “parenthesis”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is P-A-R-E-N-T-H-E-S-I-S - every other letter order is a misspelling in standard orthography.
- Say it as /pəˈɹɛnθəsɪs/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “parentheses” - see the side-by-side comparison. parenthesis vs parentheses
- 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.