LATIN DICTIONARYLexicon Latīnum
suffix

-ātim

-ātim
Classical[ˈaː.tĩː]Ecclesiastical[ˈaː.tim]

Meaning

  1. morphemeAdverbial suffix denoting something being in the form of a noun
    nōmen (“name”) → nōminātim (“by name”)
    oppidum (“town”) → oppidātim (“in every town”)
  2. morpheme-meal (X by X)
    gradus (“step”) → gradātim (“step by step”)
    littera (“letter”) → litterātim (“letter by letter”)

Origins

Originally from the accusative singular ending -tim of nouns descended from PIE nouns using the suffix Proto-Indo-European *-tis like pars; later extended with the first conjugation perfect passive participial suffix -ātus.

Quick answers

What does -ātim mean in Latin?
-ātim, a suffix, means “Adverbial suffix denoting something being in the form of a noun; -meal (X by X)”.
How do you pronounce -ātim?
In classical Latin, [ˈaː.tĩː]; in ecclesiastical (church) Latin, [ˈaː.tim].