pentagonal

/pɛnˈtæɡənəl/

//pɛnˈtæɡənəl// adj

By · According to Wiktionary data (CC BY-SA) ·

"pentagonal" is a 10-letter English headword indexed on PlainSpell.

The verdict

“pentagonal” is uncommon English (frequency #86,621 among 46,516 “P” headwords), classed as an adjective. The kind of spelling people second-guess.

#86,621
frequency rank, English
46,516
“P” headwords

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Of, relating to, or shaped like a pentagon.

Key facts for pentagonal
PropertyValue
Headwordpentagonal
LanguageEnglish
Part of speechAdjective
IPA/pɛnˈtæɡənəl/
Letters10
Frequency rank#86,621
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “pentagonal” sits in English frequency

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right). pentagonal lands here:

#1#100#1K#10K#100K
← used constantlyrarely used →

Scale is logarithmic (each tick is 10× rarer). Source: FrequencyWords open word-frequency list.

Rare enough to double-check

pentagonal is uncommon English at frequency #86,621 among 46,516 “P” headwords, classed as anadjective, transcribed /pɛnˈtæɡənəl/. Rarity is why readers land here mid-draft. Gloss: "Of, relating to, or shaped like a pentagon.".

No generated misspelling entries exist for pentagonal in our index, since its letter sequence doesn't invite the usual edit-distance slips. No close-neighbour confusable shows up for this headword in our dataset, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.

Etymologically, the entry records: From pentagon + -al. The correct English form is pentagonal, spelled P-E-N-T-A-G-O-N-A-L.

Definition

  1. 1
    Of, relating to, or shaped like a pentagon.

Etymology

From pentagon + -al.

This word in other languages

pentágono(Español)

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 "pentagonal"?
"pentagonal" is spelled P-E-N-T-A-G-O-N-A-L. The IPA pronunciation is /pɛnˈtæɡənəl/.
What does "pentagonal" mean?
As an adjective, "pentagonal" means: Of, relating to, or shaped like a pentagon.
How do you pronounce "pentagonal"?
The IPA (International Phonetic Alphabet) transcription for "pentagonal" is /pɛnˈtæɡənəl/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "pentagonal"?
From pentagon + -al. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Using “pentagonal”

The practical upshot for anyone who landed here from a spell-check.

  • The one correct English spelling is P-E-N-T-A-G-O-N-A-L - every other letter order is a misspelling in standard orthography.
  • Say it as /pɛnˈtæɡənəl/ (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

Other uncommon English words near this rank

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.

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list FrequencyWords open word-frequency list