Where does “presumability” come from?

presumability (English) comes from English ability, from Middle English abilite, from Old French ableté, from Latin habilitās, from Latin habilis, from Latin -ilis, from Proto-Italic -elis, from Proto-Indo-European -elis — Forms agent nouns from verbal roots.

presumability (English): The extent to which something can be presumed or relied upon to be true

Definitions

  1. The extent to which something can be presumed or relied upon to be true

Ancestry of “presumability”, step by step

presumability traces back through two separate lines of ancestry.

via English ability

StepLanguageWordMeaning
1EnglishabilitySuitableness; The quality or state of being able;...
2Middle Englishabilitesuitability, aptitude, ability
3Old Frenchableté
4Latinhabilitāsability, aptitude, fitness
5Latinhabilisable to have/possess/maintain; having sufficient...
6Latin-ilis-ile
7Proto-Italic-elis
8Proto-Indo-European-elis
9Proto-Indo-European-lósForms agent nouns from verbal roots

via English presume

StepLanguageWordMeaning
1EnglishpresumeTo be so presumptuous as (to do something) without proper authority or permission
2Englishpresumablyable to be sensibly presumed
3English-ablyUsed to form adverbs corresponding to adjectives...
4English-lyUsed to form adjectives from nouns, the...
5EnglishgrislyHorrifyingly repellent; gruesome, terrifying;...
6Middle Englishgrisely
7Old Englishgrisliċgrisly, horrible; dreadful, horrid
8Old English-līċsuffix forming {{glossary|adjective}}s meaning...
9Proto-Germanic*-līk
Every word from Proto-Indo-European -lósEvery word from Latin -ilisEvery word from Latin habilis