Where does “ninetysomething” come from?

ninetysomething (English) comes from English something, from Middle English somþyng, from Old English sum, from Proto-West Germanic *sum, from Proto-Germanic sumaz, from Proto-Indo-European sem- — together, one.

ninetysomething (English): An indeterminate value between 90 (inclusive) and 100 (exclusive)

Definitions

  1. An indeterminate value between 90 (inclusive) and 100 (exclusive)

Ancestry of “ninetysomething”, step by step

ninetysomething traces back through two separate lines of ancestry.

via English something

StepLanguageWordMeaning
1EnglishsomethingAn uncertain or unspecified thing; one thing; A...
2Middle Englishsomþyngsomething
3Old Englishsumsome
4Proto-West Germanic*sumsome
5Proto-Germanicsumazsome (one), a certain (one)
6Proto-Indo-Europeansem-together, one

via English ninety

StepLanguageWordMeaning
1EnglishninetyThe cardinal number occurring after eighty-nine...
2Middle Englishnyntyninety
3Old Englishhundniġontiġninety
4Proto-Germanicnewuntēhundąninety
Every word from Proto-Indo-European sem-Every word from Proto-Germanic sumazEvery word from Proto-West Germanic *sum