-atus

From Proto-Italic *-ātos, from Proto-Indo-European *-eh₂tos. A "pseudo-participle" possibly related to -tus, though similar formations in other Indo-European languages show that it was distinct from it already in Indo-European times. Compare -ītus, -ūtus.

Cognate to Proto-Slavic *-atъ, Proto-Germanic *-ōdaz (English -ed (“having”)).

-ātus (feminine -āta, neuter -ātum); first/second-declension suffix

2. -ed. Used to form adjectives from nouns indicating the possession of a thing or feature.

   ‎barba (“beard”) + ‎-ātus → ‎barbātus (“bearded, having a beard”)

   ‎caetra (“a type of short Spanish shield”) + ‎-ātus → ‎caetrātus (“armed with a caetra”)

   ‎toga (“toga”) + ‎-ātus → ‎togātus (“wearing a toga, clad in a toga”)

3. Used to form adjectives from other adjectives, especially color names, with the sense "wearing [adjective](-colored) clothes".

   ‎albus (“white”) + ‎-ātus → ‎albātus (“clothed in white”)

   ‎āter (“black”) + ‎-ātus → ‎atrātus (“clothed in black”)

   ‎sordidus (“unclean, sordid”) + ‎-ātus → ‎sordidātus (“in dirty clothes, shabbily dressed”)

4. -like, -ate. Used to form adjectives from nouns indicating a resemblance or likeness to the noun.

   ‎rēticulum (“small net”) + ‎-ātus → ‎rēticulātus (“reticulated, net-like”)

   ‎vir (“man”) + ‎-ātus → ‎virātus (“manly, manful”)

First/second-declension adjective.

• -āticus, -āticum
• -ātim
• -ātiō

Formed by rebracketing of action nouns in -tus, -tūs formed from the perfect passive participle of first conjugation verbs, such as mercātus (mercor + -tus) or pecūlātus (peculor + -tus), where -ā- is actually part of the stem; from Proto-Italic *-tus, from Proto-Indo-European *-tus (suffix deriving action nouns from verb roots).

-ātus m

1. Added to nouns or adjectives to form nouns denoting a rank or office, a group of officials associated with such a rank or office or a certain state.

   ‎triumvir + ‎-ātus → ‎triumvirātus

   ‎apostolus + ‎-ātus → ‎apostolātus

   ‎reus (“guilty”) + ‎-ātus → ‎reātus (“guiltyness”)

Fourth-declension noun.

• English: -ate
• → French: -at (learned)
• → Norwegian Bokmål: -at
• Italian: -ato
• Portuguese: -ado