Where does “non-leap year” come from?

non-leap year (English) comes from English non, from French non, from Old French non, from Latin nōn, from Old Latin noenum, from Proto-Indo-European óynos — one; single.

non-leap year (English): A year that does not contain the day February 29

Definitions

  1. A year that does not contain the day February 29

Ancestry of “non-leap year”, step by step

non-leap year traces back through two separate lines of ancestry.

via English non

StepLanguageWordMeaning
1EnglishnonObsolete form of none
2Frenchnonno; not; a no, a negative response
3Old Frenchnonno; not; Alternative form of nom
4Latinnōnnot
5Old Latinnoenum—
6Proto-Indo-Europeanóynosone; single

via English leap year

StepLanguageWordMeaning
1Englishleap yearA year in the Julian or Gregorian calendars with...
2Middle Englishlepe-yer—
3Middle EnglishlepA basket; a bucket
Every word from Proto-Indo-European óynos →Every word from Old Latin noenum →Every word from Latin nōn →