outside of

prep

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

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

The verdict

“outside of” is outside the top-ranked English vocabulary, used as a preposition - the kind of word writers most often double-check.

Unranked
below top-frequency English
10
letters

According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Outside.

Key facts for outside of
PropertyValue
Headwordoutside of
LanguageEnglish
Part of speechPreposition
Letters10
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Where “outside of” sits in English frequency

outside of falls 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.

Spelling & Dictionary Insight

The English entry for outside of is 10 letters long, classified as a preposition. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. Wiktionary records 2 distinct senses for this headword, so context determines which meaning a reader should apply.

We couldn't generate a plausible misspelling set for outside of, typically a sign the spelling maps closely to how the word sounds. We don't track a confusable pairing for this entry, which tends to mean the word is visually distinctive enough to stand on its own.

This entry's etymology isn't recorded, so its spelling is easiest explained by how it's pronounced rather than where it came from. The correct English form is outside of, spelled O-U-T-S-I-D-E- -O-F.

Definition

  1. 1
    Outside.
  2. 2
    Aside from; besides.

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 "outside of"?
"outside of" is spelled O-U-T-S-I-D-E- -O-F.
What does "outside of" mean?
As a preposition, "outside of" means: Outside.
What language does "outside of" come from?
"outside of" is a English word. PlainSpell covers definitions, pronunciations, and spelling data across English, Spanish, Portuguese, French, and German.
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 “outside of”

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

  • The one correct English spelling is O-U-T-S-I-D-E- -O-F - every other letter order is a misspelling in standard orthography.
  • 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.

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

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