It means that each member gets one vote on matters put to the vote at general meetings, not counting any proxy votes that the member may also be casting at the same general meeting.

At this link you'll see a set of nonprofit/association statuts/corporate articles that have identical language, and also explain further how this works: http://www.arpege27.fr/l-association/statuts/

Toward the bottom of Article 8 of those statuts, it says:

"Chaque membre de l’association ne dispose que d’une seule voix lors d’un vote, hors pouvoir....

Chaque membre peut détenir un maximum de 3 pouvoirs. Un pouvoir n’est valable que sur présentation, au moment du vote, d’un document signé par le délégataire mentionnant son nom et le nom de la personne à qui le pouvoir est délégué. Un pouvoir n’est valable que pour l’assemblée générale (ordinaire, extraordinaire) pour laquelle il a été émis."

So for that association, each member gets one vote for themselves on general meeting matters, and may also cast up to three proxy votes at the same general meeting.

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Note added at 6 hrs (2020-01-08 21:29:30 GMT)
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PS to clarify. The point is that any proxy votes that a member may be casting are not counted towards the 1 vote that the member gets to cast on their own behalf.