Where does “oneitis” come from?

oneitis (English) comes from English One, from Middle English on, from Old English on, from Proto-West Germanic ana, from Proto-Germanic *an, from Proto-Germanic ana, from Proto-Indo-European h₂en- — on, onto.

oneitis (English): Attraction towards a single potential partner to...

Definitions

  1. Attraction towards a single potential partner to...

Ancestry of “oneitis”, step by step

oneitis traces back through two separate lines of ancestry.

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 itis

StepLanguageWordMeaning
1EnglishitisA medical condition accompanied by inflammation;...
2English-itisSuffix denoting diseases characterized by...
3New Latin-ītis
4Ancient Greek-ῖτιςfemale equivalent of -ίτης
Every word from Proto-Indo-European h₂en-Every word from Proto-Germanic anaEvery word from Proto-Germanic *an