What is the meaning of -tta?

Suffix for the abessive case: without

A suffix for the partitive singular.

Forms certain adverbs, typically of manner.

Forms some nouns, generally for places.

Forms the third-person singular past tense of verbs (definite conjugation).

Forms the verbal participle of certain verbs, always following the agent noun.

This suffix forms a class of neuter abstract nouns from adjectives and nouns, and express the state, nature or quality of being that which is denoted by the adjective or noun.

Source: wiktionary.org