suo

The Italian word "suo" is a possessive adjective that translates to "his," "her," "its," or "your" (formal) in English, depending on the context.

Meaning:

• It indicates possession, referring to something belonging to the third person singular (he, she, it) or the formal second person singular (You, formal).
• The form "suo" is masculine singular, so it modifies masculine singular nouns.
• Corresponding feminine singular forms are "sua".
• To agree in number, the plural forms would be "suoi" (masculine plural) and "sue" (feminine plural).

Examples:

• Il suo libro (His/her/your (formal) book)
• La sua casa (His/her/your (formal) house)

Etymology and Parts:

• "Suo" derives from the Latin "suus," meaning "his own," "her own," or "its own."

Pronouns / Possessive Adjectives:

• Subject to gender and number agreement with the noun it modifies, not the possessor.

Synonyms:

• "Di lui" (of him), "di lei" (of her) — but these are generally used in constructions like "il libro di lui" for emphasis.
• English equivalents: his, her, its, your (formal) depending on context.

Antonyms:

• There is no direct antonym, but in the possessive sense, opposites could occur in color words like "altrui" meaning "belonging to another" or "someone else's," but these are different in usage.

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Summary:
"Suo" is a key possessive adjective in Italian for masculine singular nouns and refers to something owned by “him,” “her,” “it,” or “you” (formal). Its form changes with the gender and number of the object owned.