Ex·trac·tion n.
 1. The act of extracting, or drawing out; as, the extraction of a tooth, of a bone or an arrow from the body, of a stump from earth, of a passage from a book, of an essence or tincture.
 2. Derivation from a stock or family; lineage; descent; birth; the stock from which one has descended. “A family of ancient extraction.”
 3. That which is extracted; extract; essence.
    They [books] do preserve as in a vial the purest efficacy and extraction of that living intellect that bred them.   --Milton.
 The extraction of roots. Math. (a) The operation of finding the root of a given number or quantity. (b) The method or rule by which the operation is performed; evolution.

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