fafillion

noun

"fafillion" is a 9-letter English headword indexed on PlainSpell.

The verdict

“fafillion” is uncommon English (outside the top frequency list), classed as a noun. The kind of spelling people second-guess.

Unranked
below top-frequency English
9
letters

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - An indefinitely large number.

Corpus desk

Index EN-fafillion · fafillion · English

fafillion · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-LONG 9 letters
  • VOW-4 4 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "F" thin
  • PHOTO-UNK Peer pending

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.

Key facts for fafillion
PropertyValue
Headwordfafillion
LanguageEnglish
Part of speechNoun
Letters9
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “fafillion” in English

fafillionsits beyond the 100,000 most-frequent English words, in the long tail of technical, archaic, or otherwise rare vocabulary where spelling doubt tends to strike hardest.

Beyond rank #100,000. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

fafillion is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "An indefinitely large number.".

The misspelling generator found no plausible variants for fafillion, which points to an orthography that plays by predictable English rules. It is not paired with a close-neighbour confusable in our dataset, since nothing in our dataset looks or sounds close enough to cause mix-ups.

Etymologically, the entry records: See -illion. The correct English form is fafillion, spelled F-A-F-I-L-L-I-O-N.

Definition

  1. 1
    An indefinitely large number.

Recorded use

Wiktionary examples

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

  1. She had asked her dad, in her piping, childlike tones, if 'a million billion fafillion' people lived in the city. He had said 'not quite', but that she was 'pretty close' and this had made her smile.
  2. The list of potential victories you could achieve with your reset is long, and it includes a fafillion wins that have nothing to do with the scale: Fewer blemishes. Thicker hair. Less join pain. Reduced cravings. No midday energy slump.

Etymology

See -illion.

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "fafillion"?
"fafillion" is spelled F-A-F-I-L-L-I-O-N.
What does "fafillion" mean?
As a noun, "fafillion" means: An indefinitely large number.
What is the origin of the word "fafillion"?
See -illion. 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.

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

Source: FrequencyWords open word-frequency list