From the ablative of sacrum (“holy, sacred object, place or act”) + sānctus (“consecrated, sacred”). Both elements ultimately from Proto-Indo-European *seh₂k- (“to make a pact; to make sacred”).
sacrōsānctus (feminine sacrōsāncta, neuter sacrōsānctum); first/second-declension adjective
First/second-declension adjective.
singular | plural | ||||||
---|---|---|---|---|---|---|---|
masculine | feminine | neuter | masculine | feminine | neuter | ||
nominative | sacrōsānctus | sacrōsāncta | sacrōsānctum | sacrōsānctī | sacrōsānctae | sacrōsāncta | |
genitive | sacrōsānctī | sacrōsānctae | sacrōsānctī | sacrōsānctōrum | sacrōsānctārum | sacrōsānctōrum | |
dative | sacrōsānctō | sacrōsānctae | sacrōsānctō | sacrōsānctīs | |||
accusative | sacrōsānctum | sacrōsānctam | sacrōsānctum | sacrōsānctōs | sacrōsānctās | sacrōsāncta | |
ablative | sacrōsānctō | sacrōsānctā | sacrōsānctō | sacrōsānctīs | |||
vocative | sacrōsāncte | sacrōsāncta | sacrōsānctum | sacrōsānctī | sacrōsānctae | sacrōsāncta |
All are (partially adapted) borrowings.