Where does “bifocality” come from?

bifocality (English) comes from English bifocal, from English bi-, from Latin bi-, from Proto-Italic *dwi- — two, bi-, di.

bifocality (English): The quality of being bifocal

Definitions

  1. The quality of being bifocal

Ancestry of “bifocality”, step by step

bifocality traces back through two separate lines of ancestry.

via English bifocal

StepLanguageWordMeaning
1EnglishbifocalHaving two focal lengths; Divided into two parts,...
2Englishbi-API; two, paired, both; half
3Latinbi-having two parts; occurring twice
4Proto-Italic*dwi-two, bi-, di

via English ity

StepLanguageWordMeaning
1Englishity—
2Ingrian-uUsed to form nouns from verbs
Every word from Proto-Italic *dwi- →Every word from Latin bi- →Every word from English bi- →