Usage Note
Dimostrante is both masculine and feminine in form — il dimostrante / la dimostrante — with plural i dimostranti / le dimostranti. It refers specifically to someone taking part in a public demonstration or protest (manifestazione). The verb is dimostrare and the related noun dimostrazione covers both a protest and a mathematical proof, so context is important.
Examples
"I dimostranti si sono radunati in piazza."
Natural Translation
The demonstrators gathered in the square.

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