veintiuna

Veintiuna is the feminine form of the Spanish cardinal number twenty-one. It is used before feminine nouns to express the value twenty-one and agrees in gender with the noun it modifies. The masculine counterpart is veintiún, which is used before masculine singular nouns. Before masculine nouns in plural, the determiner remains veintiún (for example, veintiún libros), while veintiuna is used before feminine nouns in both singular and plural (for example, veintiuna monedas, veintiuna personas).

In practice, veintiuna appears in phrases such as veintiuna monedas (21 coins) or veintiuna personas (21 people). When counting or when no noun follows, the form veintiuno or veintiún may be used depending on gender and whether the noun is explicit, and veintiuno is often used when the number stands alone or as a pronoun.

Phonetics and spelling notes: veintiún carries an accent on the u (veintiún) to mark the stress before masculine singular nouns; veintiuna has no accent. The form veintiuno (with no accent) is typically used when the noun is omitted or in certain numeral contexts.

Other uses: Veintiuna is also the name of a card game in many Spanish-speaking regions, a variant of Blackjack. In that context, players try to reach or approach a total of twenty-one points, with rules and deck composition varying by country and local tradition.

Overall, veintiuna functions as a gendered numeral form allied to feminine nouns, distinct from the masculine veintiún and the neutral/standalone veintiuno.