Where does “one-year-old” come from?

one-year-old (English) comes from English Old, from Middle English old, from Old English ald, from Proto-Germanic *ald, from Proto-Germanic aldaz, from Proto-Indo-European h₂eltós, from Proto-Indo-European h₂él- — to grow, nourish.

one-year-old (English): having lived or existed for one year; a child or...

Definitions

  1. having lived or existed for one year; a child or...

Ancestry of “one-year-old”, step by step

one-year-old traces back through 3 separate lines of ancestry.

via English Old

StepLanguageWordMeaning
1EnglishOldOS grid ref SP7873
2Middle Englisholdold; long extant or existent
3Old EnglishaldAlternative form of eald
4Proto-Germanic*ald
5Proto-Germanicaldazold, grown up
6Proto-Indo-Europeanh₂eltós
7Proto-Indo-Europeanh₂él-to grow, nourish

via English One

StepLanguageWordMeaning
1EnglishOneThe number represented by the Arabic numeral 1; the numerical value equal to that cardinal number
2Middle Englishonon, in; on; Alternative form of oon
3Old Englishonon, in, at, among; from
4Proto-West Germanicanaon
5Proto-Germanic*an
6Proto-Germanicanaon, at; on, onto; ana
7Proto-Indo-Europeanh₂en-on, onto

via English year

StepLanguageWordMeaning
1EnglishyearA solar year, the time it takes the Earth to...
2Middle Englishyeeryear
3Old Englishġēaryear
4Proto-West Germanicjāryear
5Proto-Germanicjērąyear; name of the J-rune
6Proto-Indo-Europeanyeh₁r-year
Every word from Proto-Indo-European h₂él-Every word from Proto-Indo-European h₂eltósEvery word from Proto-Germanic aldaz