LATIN DICTIONARYLexicon Latīnum
proper noun · masculinesecond declension

Iansenius

Iansenius m sg (genitive Ianseniī or Iansenī)
Classical[jãːˈsɛ.ni.ʊs]Ecclesiastical[janˈsɛː.ni.us]

Meaning

  1. New Latinmasculinesingulara surname from Dutch — famously held by
  2. New LatinmasculinesingularCornelius Jansen (1585–1638), Dutch Catholic bishop and theologian.

Declension

declension
formsingularplural
nominativeIansenius—
genitiveIanseniī
Iansenī		—
dativeIanseniō—
accusativeIansenium—
ablativeIanseniō—
vocativeIansenī—

Origins

From Dutch Jansen + Latin -ius.

Quick answers

What does Iansenius mean in Latin?
Iansenius, a proper noun, means “a surname from Dutch — famously held by”.
What is the genitive of Iansenius?
The genitive singular is Ianseniī. Iansenius is masculine, second declension.
How do you pronounce Iansenius?
In classical Latin, [jãːˈsɛ.ni.ʊs]; in ecclesiastical (church) Latin, [janˈsɛː.ni.us].