firmament
/ˈfɜːməm(ə)nt/
"firmament" is a 9-letter English headword indexed on PlainSpell.
The verdict
“firmament” is a moderately-common English word, ranked #48,747 in English word frequency and used as a noun.
- #48,747
- frequency rank, English
- 9
- letters
- 14
- tracked misspellings
- 1
- confusable pair
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - The vault of the heavens, where the clouds, sun, moon, and stars can be seen; the heavens, the sky.
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 | firmament |
| Language | English |
| Part of speech | Noun |
| IPA | /ˈfɜːməm(ə)nt/ |
| Letters | 9 |
| Frequency rank | #48,747 |
| Misspellings tracked | 14 |
| Confusable pairs | 1 |
| Source | Wiktionary (kaikki.org) |
Where “firmament” sits in English frequency
Spelling & Dictionary Insight
The English entry for firmament is 9 letters long, classified as a noun, and transcribed in the International Phonetic Alphabet as /ˈfɜːməm(ə)nt/. Corpus data places it at rank #48,747 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it. Wiktionary records 7 distinct senses for this headword, so context determines which meaning a reader should apply.
Our generated misspelling index lists 14 likely wrong-spelling variants for firmament, with forms such as "ffirmament", "fimrament", and "firamment". Every one of these variants traces to a single-character edit -- an added or dropped letter, a swapped consonant, or a vowel swap -- the kind of slip a spell-checker is built to catch. It also participates in 1 confusable-pair relationship, "filament", where similar look or sound leads writers to substitute one word for another in context.
Etymologically, the entry records: From Middle English firmament, furmament (“heaven; sky”), from Old French firmament (“firmament”), or from its etymon Latin firmāmentum (“support; sky”), from firmāre (“to strengthen”) + -mentum (suffix indicating an instrument or medium, or the result of a… The correct English form is firmament, spelled F-I-R-M-A-M-E-N-T.
Definition
- 1The vault of the heavens, where the clouds, sun, moon, and stars can be seen; the heavens, the sky.
- 2The field or sphere of an activity or interest.
- 3In the geocentric Ptolemaic system, the eighth celestial sphere which carried the fixed stars; (countable, by extension) any celestial sphere.
- 4The abode of God and the angels; heaven.
- 5A piece of jewellery worn in a headdress with numerous gems resembling stars in the sky.
- 6A basis or foundation; a support.
- 7The act or process of making firm or strengthening.
Etymology
From Middle English firmament, furmament (“heaven; sky”), from Old French firmament (“firmament”), or from its etymon Latin firmāmentum (“support; sky”), from firmāre (“to strengthen”) + -mentum (suffix indicating an instrument or medium, or the result of an action). Firmāre is the present active infinitive of firmō (“to make firm, strengthen”), from firmus (“firm, strong, stable”), ultimately from Proto-Indo-European *dʰer- (“to hold; to support”). The Latin word was used in the Vulgate version of the Bible to translate the Ancient Greek στερέωμα (steréōma, “foundation, framework; firmament”) in the Septuagint (Greek Old Testament), which in turn was used to translate the Hebrew רָקִיעַ (rāqī́aʿ, “celestial dome, vault of heaven”), from the root ר־ק־ע (r-q-`); in Classical Syriac the similar root ܪ ܩ ܥ (related to compacting) gave rise to ܪܩܝܥܐ (rəqīʿā, “compact; firm; firmament, heavens, sky; celestial sphere”).
This word in other languages
Common misspellings
Also misspelled as: ffirmament,fimrament,firamment,firmaemnt,firmamennt,firmamentt,firmametn,firmamment,firmamnet,firmmaent,firmmament,firrmament,frimament,ifrmament
Misspelling Pattern Breakdown
How far each generated variant is from the correct spelling of firmament - expressed in single-character edits (insert, delete, or swap one letter). Bigger bars stand out at a glance; a one-edit slip is the hardest to catch.
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 "firmament"?
What does "firmament" mean?
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Is PlainSpell free to use?
Using “firmament”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is F-I-R-M-A-M-E-N-T - every other letter order is a misspelling in standard orthography.
- Say it as /ˈfɜːməm(ə)nt/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Don't mix it up with “filament” - see the side-by-side comparison. firmament vs filament
- 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.