Usage Note
Documental as a noun is always masculine: un documental sobre la naturaleza. As an adjective it means 'documentary' or 'document-based' (prueba documental) and is invariable by gender. Do not confuse with documento (a document); documental refers specifically to a film or TV documentary. The plural is documentales.
Examples
"Vimos un documental sobre los océanos."
Natural Translation
We watched a documentary about the oceans.
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