Prolog
"prolog" is a 6-letter English headword indexed on PlainSpell.
The verdict
“Prolog” is uncommon English (frequency #63,908 among 46,516 “P” headwords), classed as a proper noun. The kind of spelling people second-guess.
- #63,908
- frequency rank, English
- 46,516
- “P” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A programming language developed in the 1970s for artificial intelligence and logic programming.
| Property | Value |
|---|---|
| Headword | Prolog |
| Language | English |
| Part of speech | Proper noun |
| Letters | 6 |
| Frequency rank | #63,908 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “Prolog” sits in English frequency
Rare enough to double-check
Prolog is uncommon English at frequency #63,908 among 46,516 “P” headwords, classed as aproper noun. Rarity is why readers land here mid-draft. Gloss: "A programming language developed in the 1970s for artificial intelligence and logic programming.".
No generated misspelling entries exist for Prolog in our index, since its letter pattern doesn't lend itself to common typo substitutions. This entry stands alone in our confusable dataset, which typically means the spelling is too distinctive to be mistaken for another word.
Etymologically, the entry records: From French Prolog, abbreviation of Programmation en Logique. The correct English form is Prolog, spelled P-R-O-L-O-G.
Definition
- 1A programming language developed in the 1970s for artificial intelligence and logic programming.
Etymology
From French Prolog, abbreviation of Programmation en Logique.
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
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Using “Prolog”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is P-R-O-L-O-G - every other letter order is a misspelling in standard orthography.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
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.