Early 17th century (in an earlier sense). From the name of Monte Oliveto (or Uliveto) near Siena, the site of the mother convent + -an, after post-classical Latin Olivetanus.
Definition of Olivetan in US English:
Olivetan
nounɒlɪˈviːtn
A member of this religious order.
Origin
Early 17th century (in an earlier sense). From the name of Monte Oliveto (or Uliveto) near Siena, the site of the mother convent + -an, after post-classical Latin Olivetanus.