what sparrow said is right ; it means you don't have to read a pdf zoomed out to 25% so that it becomes to small to be legible, because the text is "fluid" (thus can "re-flow") and words that don't fit on one line can moved down to the next line.
you can see an exemple of reflow on the fly if you select "fluid" in the "quick style chooser" in the blue menu bar at the very bottom of this page, then make your browser window smaller or larger. you'll see the text reflowing live to adjust to the new width available to it.
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