-tudo

From Proto-Indo-European *-tu- + *-d- + *-h₃onh₂-. Compare Ancient Greek -σῠ́νη (-súnē) and -δών (-dṓn).

• (Classical) IPA^(key): /ˈtuː.doː/, [ˈt̪uːd̪oː]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈtu.do/, [ˈt̪uːd̪o]

-tūdō f (genitive -tūdinis); third declension

1. -itude, -ness; used to form abstract nouns indicating a condition or state.

• The suffix -tūdō is added to an adjective to form an abstract third declension feminine noun indicating a condition or state.

Examples:

• ‎magnus (“great”) + ‎-tudo → ‎magnitūdō (“greatness”)
• ‎mollis (“soft”) + ‎-tudo → ‎mollitūdō (“softness”)
• ‎valeo (“be healthy”) + ‎-tudo → ‎valētūdō (“health”)

• The related suffix -dō also forms abstract nouns of state, but is added to verb or participle stems. The resulting nouns often end in -tūdō as a result of the verb stem interaction with -dō.

Third-declension noun.

• (-itude): -dō, -ia, -itia, -tās