-idade

• -dade

From Old Galician-Portuguese -idade, from Latin -itātem, from Proto-Indo-European *-teh₂ts.

-idade f (noun-forming suffix, plural -idades)

1. forms nouns, from adjectives, indicating the state, property or quality of conforming to the adjective’s description; -ity; -ness; -hood

   ‎auténtico (“authentic”) + ‎-idade → ‎autenticidade (“authenticity”)

• -dade

From Old Galician-Portuguese -idade, from Latin -itātem, from Proto-Indo-European *-teh₂ts.

• Rhymes: (Brazil) -ad͡ʒi, (Portugal) -adɨ

-idade f (noun-forming suffix, usually uncountable, plural -idades)

1. forms nouns, from adjectives, indicating the state, property or quality of conforming to the adjective’s description; -ity; -ness; -hood

   Synonyms: -or, -eza, -ez

   ‎desumano (“inhumane”) + ‎-idade → ‎desumanidade (“inhumanity”)

2. forms nouns, from adjectives, indicating something that has the given quality; -ity

   ‎côncavo (“concave”) + ‎-idade → ‎concavidade (“concavity”)

The following ending(s) change(s) in words appended with this suffix:

• ⟨-ão⟩ (as a non-verb suffix, incl. plurals) → ⟨-on⟩
• ⟨-ã(o)⟩ (incl. plurals) → ⟨-(i)an⟩, ⟨-am⟩, or ⟨-(i)on⟩, depending on the base word's etymology
• ⟨-m⟩ (incl. plurals) → ⟨-n⟩
• ⟨-vel⟩ (unstressed and adjectival, incl. plurals) → ⟨-bil⟩
• ⟨-z⟩ (adjectival, incl. plurals) → ⟨-c⟩