LATIN DICTIONARYLexicon Latīnum
suffix

-pte

-pte
Classical[ptɛ]Ecclesiastical[pte]

Meaning

  1. morphemeA particle usually affixed to the ablative singular of these adjectives (meus, tuus, suus, noster, vester) most frequently to that of suus in order to express more emphatically that a thing belongs to a person as contrasted with what is not his own
    ego meaning "I" → mepte
    suus → suapte

Origins

From some syncopated form of potis still whole in utpote.

Quick answers

What does -pte mean in Latin?
-pte, a suffix, means “A particle usually affixed to the ablative singular of these adjectives (meus, tuus, suus, noster, vester) most frequently to that of suus in order to express more emphatically that a thing belongs to a person as contras”.
How do you pronounce -pte?
In classical Latin, [ptɛ]; in ecclesiastical (church) Latin, [pte].