What is a propal, anyway ?

Can anyone explain to me what is a propal, exactly? I know it’s generally used to mean proposal, but what good is an abbreviation if we only remove two letters (in this case, O and S)? Or am I completely misled, and propal is actually some latin word? I’ve been unable to find an answer to this with google.
(note: we use the word propal in french as well)

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