so long
"so-long" is a 6-letter English headword indexed on PlainSpell.
The verdict
“so long” is outside the top-ranked English vocabulary, used as an interjection - the kind of word writers most often double-check.
- Unranked
- below top-frequency English
- 7
- letters
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - Goodbye; a valediction used when leaving or departing from a person or place.
| Property | Value |
|---|---|
| Headword | so long |
| Language | English |
| Part of speech | Interjection |
| Letters | 7 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “so long” sits in English frequency
Spelling & Dictionary Insight
The English entry for so long is 7 letters long, classified as an interjection. It sits outside the most-frequent rank tiers, which is often why uncommon words generate more spelling variants per reader. The dominant gloss from Wiktionary reads: "Goodbye; a valediction used when leaving or departing from a person or place.".
so long doesn't appear in our generated misspelling index, since its letter sequence doesn't invite the usual edit-distance slips. No confusable counterpart is on file for this word, since nothing in our dataset looks or sounds close enough to cause mix-ups.
Etymologically, the entry records: Uncertain. Compare to Swedish hej så länge and Russian пока (poka). See Douglas Harper (2001–2026), “so long”, in Online Etymology Dictionary. The correct English form is so long, spelled S-O- -L-O-N-G.
Definition
- 1Goodbye; a valediction used when leaving or departing from a person or place.
Etymology
Uncertain. Compare to Swedish hej så länge and Russian пока (poka). See Douglas Harper (2001–2026), “so long”, in Online Etymology Dictionary.
This word in other languages
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
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Using “so long”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is S-O- -L-O-N-G - 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.