Usage Note
Treintena is a collective numeral meaning approximately thirty or a group of around thirty items or people, parallel to decena (about ten) and veintena (about twenty). It is approximate, not exact — una treintena de personas means 'around thirty people.' It is more common in written Spanish than in everyday speech.
Examples
"Una treintena de personas asistieron al acto."
Natural Translation
About thirty people attended the event.

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