-τατος

Possibly from Proto-Indo-European *-tm̥mós with influence from *-istos.

-τατος • (-tatos) m (feminine -τάτη, neuter -τᾰτον); first/second declension

1. Added to adjective stems to form superlative forms

   ‎δῆλος (dêlos, “clear”) + ‎-τατος (-tatos) → ‎δηλότατος (dēlótatos, “the clearest”)

   ‎σοφός (sophós, “wise”) + ‎-τατος (-tatos) → ‎σοφώτατος (sophṓtatos, “the wisest”)

• -ιστος (-istos)

• -τᾰτᾰ (-tata)

-τᾱτος • (-tātos) f

1. (Doric) feminine genitive singular of -τᾱς (-tās)

-τατος • (-tatos)

1. Added to most adjectives to form the absolute superlative.

   ‎σοφός (sofós, “wise”) + ‎-τατος (-tatos) → ‎σοφότατος (sofótatos, “very wise”)

   ‎βαθύς (vathýs, “deep”) + ‎-τατος (-tatos) → ‎βαθύτατος (vathýtatos, “very deep”)

• For relative superlative see -τερος (-teros)

• -τατα (-tata, suffix for superlative degree of adverbs)
• -τερος (-teros, suffix for comparative degree)