tertiary
/ˈtɜː.ʃi.ə.ɹiː/
"tertiary" is a 8-letter English headword indexed on PlainSpell.
The verdict
“tertiary” is a moderately-common English word, ranked #14,439 in English word frequency and used as an adjective.
- #14,439
- frequency rank, English
- 8
- letters
- 12
- tracked misspellings
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Of third rank or order; subsequent.
| Property | Value |
|---|---|
| Headword | tertiary |
| Language | English |
| Part of speech | Adjective |
| IPA | /ˈtɜː.ʃi.ə.ɹiː/ |
| Letters | 8 |
| Frequency rank | #14,439 |
| Misspellings tracked | 12 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “tertiary” sits in English frequency
Spelling & Dictionary Insight
The English entry for tertiary is 8 letters long, classified as an adjective, and transcribed in the International Phonetic Alphabet as /ˈtɜː.ʃi.ə.ɹiː/. Corpus data places it at rank #14,439 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 3 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 12 likely wrong-spelling variants for tertiary, with forms such as "etrtiary", "teritary", and "terrtiary". 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 is not paired with a close-neighbour confusable in our dataset, since no other headword is close enough in sound or shape to pair with it.
Etymologically, the entry records: PIE word *tréyes Borrowed from the Latin tertiārius (“of the third part or rank”), from tertius (“third”) (from Proto-Indo-European *tr̥tyós, whence English third) + -ārius (whence the English suffix -ary); compare the French tertiaire. By surface analysis… The correct English form is tertiary, spelled T-E-R-T-I-A-R-Y.
Definition
- 1Of third rank or order; subsequent.
- 2Possessing some quality in the third degree; especially having been subjected to the substitution of three atoms or radicals.
- 3Of quills: growing on the innermost joint of a bird's wing; tertial.
Etymology
PIE word *tréyes Borrowed from the Latin tertiārius (“of the third part or rank”), from tertius (“third”) (from Proto-Indo-European *tr̥tyós, whence English third) + -ārius (whence the English suffix -ary); compare the French tertiaire. By surface analysis, terti- + -ary.
This word in other languages
Common misspellings
Also misspelled as: etrtiary,teritary,terrtiary,tertairy,tertiarry,tertiaryy,tertiayr,tertiray,terttiary,tetriary,tretiary,ttertiary
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of tertiary - 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 "tertiary"?
What does "tertiary" mean?
What are common misspellings of "tertiary"?
How do you pronounce "tertiary"?
What is the origin of the word "tertiary"?
Is PlainSpell free to use?
Using “tertiary”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is T-E-R-T-I-A-R-Y - every other letter order is a misspelling in standard orthography.
- Say it as /ˈtɜː.ʃi.ə.ɹiː/ (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.