I found it hard to understand the meaning of "propositions" in this sentence. Could you please elaborate on what the word means? Thank you so much!

"Anthropologist Jane Guyer has pointed out that a priori connections between different scales of value do not exist; rather, they are pegged together through the performance or enactment of propositions."

I found it hard to understand the meaning of "propositions." Could you please elaborate on what the word means? Thank you so much!