What does hypothesis mean in Latin?

hypothesis, a noun, means “hypothesis”.

What is the genitive of hypothesis?

The genitive singular is hypothesis. hypothesis is feminine, third declension.

In classical Latin, [hyˈpɔ.tʰɛ.sɪs]; in ecclesiastical (church) Latin, [iˈpɔː.te.s̬is].

noun · femininethird declension

hypothesis f (genitive hypothesis or hypotheseōs or hypothesios)

Classical[hyˈpɔ.tʰɛ.sɪs]Ecclesiastical[iˈpɔː.te.s̬is]

femininehypothesis
Erunt igitur in illa hypotheſi Triangulus, Sexangulus, & Circulus una figura.Therefore, in that hypothesis, the Triangle, the Hexagon, and the Circle will be one figure.1659, Juan Caramuel Lobkowitz, Caramuelis metalogica disputationes de logicae essentia, proprietatibus, et operationibus continens, volume 3, page 139:

declension
form	singular	plural
nominative	hypothesis	hypothesēs hypotheseis
genitive	hypothesis hypotheseōs, hypothesios	hypothesium
dative	hypothesī	hypothesibus
accusative	hypothesim hypothesin, hypothesem	hypothesēs hypothesīs
ablative	hypothesī hypothese	hypothesibus
vocative	hypothesis hypothesi	hypothesēs hypotheseis

Borrowed from Ancient Greek ὑπόθεσις (hupóthesis, “hypothesis”, noun).