"to banish;" "to wonder;" "to miss"
11th cent. From Latin extranear 'id.,' from extraneus "foreign," from extra "outside" (see extra- for further etymology).
12th cent. From Latin extraneus 'id.,' ultimately from extra "outside" (see extra-).
Even in Latin the suffix had already fossilized, it was last productive in Proto-Italic. From Latin *-dex 'id.'
From Proto-Italic *-dik- 'id.' From Proto-Indo-European *-di̯ḱ- 'id.' From the root *dei̯ḱ- "to say" (whence decir).
Asturian -áu, Portuguese -ado, Catalan -at, French -é, Italian -ato
Oscan -díss, Marrucinian -dix, Marsian -dis, Paelignian -dix, Volscian -dix
Gothic ga-teihan "to indicate"
Ancient Greek δείκνῡμι (deíknymi) "to show"
Sanskrit diś- "to show"
Abstract noun-forming suffix.
From Latin -itia 'id.,' via re-interpretation of -itas, a noun-forming suffix indicating a state of being (see -edad, -idad).