Prolog
"prolog" is a 6-letter English headword indexed on PlainSpell.
The verdict
“Prolog” is uncommon English (frequency #63,908 among 4,417 “P” headwords), classed as a proper noun. The kind of spelling people second-guess.
- #63,908
- frequency rank, English
- 4,417
- “P” headwords
According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A programming language developed in the 1970s for artificial intelligence and logic programming.
Corpus desk
Index EN-prolog · Prolog · English
Prolog · rank #63,908 · 0 variants · 0 confusables
- FREQ-RARE #63,908
- LEN-LONG 6 letters
- VOW-2 2 vowels
- CONFUS-0 No pairs
- VAR-0 0 variants
- BOOK-MID 4,417
- PHOTO-FINISH prissy
Nearest frequency peer: prissy (-1 rank slots)
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.
Long-tail ranks near “Prolog”
Sparse band: bars invert rank so rarer forms read shorter
- Prager
Prager
36,097 corpus weight
- prefab
prefab
36,096 corpus weight
- pretension
pretension
36,095 corpus weight
- prissy
prissy
36,094 corpus weight
- Prolog
Prolog
36,093 corpus weight
- punctuate
punctuate
36,090 corpus weight
What this shows Long-tail view: where “Prolog” sits against similarly uncommon English ranks.
| 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) |
Long-tail rank of “Prolog” in English
Rare enough to double-check
Prolog is uncommon English at frequency #63,908 among 4,417 “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.
Recorded use
Wiktionary exampleThese source excerpts show how Prolog appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.
Prolog has been used for many purposes, but its inventor, Alain Colmerauer, was interested in computational linguistics, and this remains a classic application for the language. Moreover, Prolog offers a number of tools which make life easier for computational linguists, and we are now going to start learning about one of the most useful of these: definit…
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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Similar English words by spelling shape
Same letter count and similar misspelling depth for "Prolog", not the corpus desk frequency band.
Same letter count
Frequency-ranked English headwords with 6 letters (nearest by frequency rank).