“Preliminary figure” は『速報値』という意味ですが、“Preliminary”という単語には『速い』や『速報』という意味はないようで、辞書には『予備』とか『準備』と書かれています。
なぜ、“Preliminary figure” が『速報値』という意味になるのか、どなたか教えて頂けませんか？

よろしくお願い致します！

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“Preliminary” means the earliest figures/numbers. It is the “quickest” report you can have, before getting the full set of numbers and calculations.

Because the “preliminary report” doesn’t include the final figures, it is only a temporary report until the final, full report is released.

I hope I could answer your question without any confusion 😅