Usage Note
Trentesimo is the ordinal numeral for 30th. Like all Italian ordinals it agrees in gender and number: trentesima (f), trentesimi (m pl), trentesime (f pl). It is used in fractions (un trentesimo = one thirtieth) and rankings; note that calendar dates use cardinals (il trenta giugno), not ordinals. Written as a numeral it appears as '30°' (m) or '30ª' (f).
Examples
"È il trentesimo anno di matrimonio."
Natural Translation
It is the thirtieth year of marriage.

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