killion

noun

"killion" is a 7-letter English headword indexed on PlainSpell.

The verdict

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

Unranked
below top-frequency English
7
letters

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

Corpus desk

Index EN-killion · killion · English

killion · unranked · 0 variants · 0 confusables

  • FREQ-UNRANKED Unranked
  • LEN-LONG 7 letters
  • VOW-3 3 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-THIN "K" 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 killion
PropertyValue
Headwordkillion
LanguageEnglish
Part of speechNoun
Letters7
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “killion” in English

killionfalls outside the top-100,000 ranked English words, the long-tail zone of technical, archaic, or low-frequency vocabulary, exactly where readers second-guess spellings most.

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

Rare enough to double-check

killion is uncommon English outside the top frequency list, classed as anoun. Rarity is why readers land here mid-draft. Gloss: "An unspecified large number (of).".

No generated misspelling entries exist for killion in our index, since its letter sequence doesn't invite the usual edit-distance slips. We don't track a confusable pairing for this entry, 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 killion, spelled K-I-L-L-I-O-N.

Definition

  1. 1
    An unspecified large number (of).

Recorded use

Wiktionary example

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

  1. You're better off waiting anyway, the pics I saw weren't that detailed as to what the darn thing did, but I got the idea and I wasn't about to download a killion pics to find out anymore.

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 "killion"?
"killion" is spelled K-I-L-L-I-O-N.
What does "killion" mean?
As a noun, "killion" means: An unspecified large number (of).
What is the origin of the word "killion"?
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