Where does “nonagenarian” come from?

nonagenarian (English) comes from Latin nonagenarius, from Latin nōnāgēnus, from Latin nonaginta, from Latin nūnāgintā, from Proto-Indo-European h₁néwn̥(d)ḱomt, from Proto-Indo-European h₁néwn̥ — nine.

nonagenarian (English): Being between the ages of 90 and 99, inclusive....

Definitions

  1. Being between the ages of 90 and 99, inclusive....

Ancestry of “nonagenarian”, step by step

StepLanguageWordMeaning
1Latinnonagenariusninety; ninety-year-old
2Latinnōnāgēnusninety each; ninety at a time
3Latinnonagintaninety; 90
4Latinnūnāgintā
5Proto-Indo-Europeanh₁néwn̥(d)ḱomtnine tens
6Proto-Indo-Europeanh₁néwn̥nine
Every word from Proto-Indo-European h₁néwn̥Every word from Proto-Indo-European h₁néwn̥(d)ḱomtEvery word from Latin nūnāgintā