LATIN DICTIONARYLexicon Latīnum
suffix

-tātīs

-tātīs
Classical[taː.tɪs]Ecclesiastical[ta.tis]

Meaning

  1. morphemei-stem accusative plural of -tās

Quick answers

What does -tātīs mean in Latin?
-tātīs, a suffix, means “i-stem accusative plural of -tās”.
How do you pronounce -tātīs?
In classical Latin, [taː.tɪs]; in ecclesiastical (church) Latin, [ta.tis].