Friday the thirteenth

Spelling & Dictionary Insight

The English entry for Friday the thirteenth is 21 letters long, classified as a noun. 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: "A particular date combination that occurs when the thirteenth day of a month falls on a Friday, and which is considered unlucky in some cultures.".

No misspelling variants are generated for Friday the thirteenth in our index, suggesting the orthography follows predictable English patterns. It is not paired with a close-neighbour confusable in our dataset, which tends to mean the word is visually distinctive enough to stand on its own.

Etymologically, the entry records: Believed to have been derived from the mass arrest of the Knights Templar on Friday, October 13, 1307. Root origin matters for spelling because borrowed morphemes (Greek, Latin, Old French, Old English) carry their source-language orthographic conventions into modern English, which is why historical etymology is often the cleanest predictor of whether a cluster like "-ough", "-eau", or "-tion" will appear. For readers arriving here from a spelling check, the authoritative guidance is: the correct English form is Friday the thirteenth, spelled F-R-I-D-A-Y- -T-H-E- -T-H-I-R-T-E-E-N-T-H, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.