What does "from" mean?

From: In certain constructions, as from forth, from out, etc., the ordinary and more obvious arrangment is inverted, the sense being more distinctly forth from, out from -- from being virtually the governing preposition, and the word the adverb. See From off, under Off, adv., and From afar, under Afar, adv. Sudden partings such as press The life from out young hearts. Byron.