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1. Gestures mean the movement of our arms, hands, heads.

2. Gestures mean the movement of our arms, hands, and heads.

Are the sentences grammatically correct?

Comments  
anonymousAre the sentences grammatically correct?

It is a rhetorical device to leave out the conjunction, but by virtue of that, you have to do it for a reason and want the resulting effect. In your isolated sentence, there is no reason to leave it out. I would use "or" instead of "and" because you don't mean that all three move at once.

Also, the grammar is a bit jarring. "Gestures are" would be better.