octogenarian

/ˌɑktəd͡ʒɪˈnɛɹiən/

//ˌɑktəd͡ʒɪˈnɛɹiən// noun

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

"octogenarian" is a 12-letter English headword indexed on PlainSpell.

The verdict

“octogenarian” is uncommon English (frequency #78,885 among 1,431 “O” headwords), classed as a noun. The kind of spelling people second-guess.

#78,885
frequency rank, English
1,431
“O” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - Synonym of eightysomething: a person between 80 and 89 years old.

Corpus desk

Index EN-octogenarian · octogenarian · English

octogenarian · rank #78,885 · 0 variants · 0 confusables

  • FREQ-RARE #78,885
  • LEN-MEGA 12 letters
  • VOW-6 6 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 1,431
  • PHOTO-FINISH Odum

Nearest frequency peer: Odum (+2 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Long-tail ranks near “octogenarian”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “octogenarian” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for octogenarian
PropertyValue
Headwordoctogenarian
LanguageEnglish
Part of speechNoun
IPA/ˌɑktəd͡ʒɪˈnɛɹiən/
Letters12
Frequency rank#78,885
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “octogenarian” in English

This scale runs from the tiny cluster of words that carry ordinary speech (left) to the long tail of words almost nobody reaches for (right).octogenarianfalls in this rarity band:

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

Scale is logarithmic (each tick is 10× rarer). Rare peers in the same band: “Odum” (#78,887), “objectivist” (#78,882), “oedema” (#78,888). Among 1,431 “O” headwords, “octogenarian” is #78,885. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

octogenarian is uncommon English at frequency #78,885 among 1,431 “O” headwords, classed as anoun, transcribed /ˌɑktəd͡ʒɪˈnɛɹiən/. Rarity is why readers land here mid-draft. Gloss: "Synonym of eightysomething: a person between 80 and 89 years old.".

Zero misspellings are on record for octogenarian in our index, which points to an orthography that plays by predictable English rules. No close-neighbour confusable shows up for this headword in our dataset, which typically means the spelling is too distinctive to be mistaken for another word.

Etymologically, the entry records: From Latin octōgēnārius + -an (suffix forming adjectives and representative nouns), either directly or via French octogénaire, from Latin octōgēnus (“80 each”) + -ārius (“-ary”), from octōgintā (“eight tens, 80”). The correct English form is octogenarian, spelled O-C-T-O-G-E-N-A-R-I-A-N.

Definition

  1. 1
    Synonym of eightysomething: a person between 80 and 89 years old.

Recorded use

Wiktionary examples

These source excerpts show how octogenarian appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. Mama was by no means the only grandma present, for the octogenarians had turned out en masse from their huts and lean-tos and were paddling about, diving and splashing as unconcernedly as though they really belonged in the sea rather than on land.
  2. Finsbury Park station, one of the most important L.N.E.R. suburban junctions, is now an octogenarian.

Etymology

From Latin octōgēnārius + -an (suffix forming adjectives and representative nouns), either directly or via French octogénaire, from Latin octōgēnus (“80 each”) + -ārius (“-ary”), from octōgintā (“eight tens, 80”).

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 "octogenarian"?
"octogenarian" is spelled O-C-T-O-G-E-N-A-R-I-A-N. The IPA pronunciation is /ˌɑktəd͡ʒɪˈnɛɹiən/.
What does "octogenarian" mean?
As a noun, "octogenarian" means: Synonym of eightysomething: a person between 80 and 89 years old.
How do you pronounce "octogenarian"?
The IPA (International Phonetic Alphabet) transcription for "octogenarian" is /ˌɑktəd͡ʒɪˈnɛɹiən/. 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 "octogenarian"?
From Latin octōgēnārius + -an (suffix forming adjectives and representative nouns), either directly or via French octogénaire, from Latin octōgēnus (“80 each”) + -ārius (“-ary”), from octōgintā (“eight tens, 80”). 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.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "octogenarian", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 12 letters (nearest by frequency rank).

nonexistence#78,874Necronomicon#78,859paradigmatic#78,917methacrylate#78,822

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

Source: FrequencyWords open word-frequency list