sixth

The word 'sixth' is a transparent ordinal number formation in English, directly following the ancient Germanic pattern. Its first element, 'six', descends from the Proto-Indo-European root swéḱs, which is the source for the number six across many Indo-European languages, including Latin 'sex' and Greek 'hex'. The second element, the ordinal suffix '-th', has its origins in the Proto-Germanic superlative suffix -ithō, which was repurposed in Old English specifically to form ordinals from cardinals. The combination literally means "the one in the position of six," a logical and consistent method that links the concrete quantity to its sequential order. This pattern, established over a millennium ago, remains perfectly clear and productive in modern English.

Structure: six + th - six: From Old English 'siex', 'sex', from Proto-Germanic sehs, from Proto-Indo-European swéḱs. Functions as the cardinal number base. - th: From Old English '-þa', '-þe', '-oþ', a suffix forming ordinal numbers from cardinals. Functions as an ordinal suffix.