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Definition of algebra:
 A treatise on this science.
 That branch of mathematics which treats of the relations of the sides and angles of triangles, which the methods of deducing from certain given parts other required parts, and also of the general relations which exist between the trigonometrical functions of arcs or angles.
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They are like those sums in algebra that you think about and worry about and cry about and try to get help from other women about, and then, all of a sudden, X works itself out into perfectly good sense.
 "The Melting of Molly", Maria Thompson Daviess. 
David went to the garden, where there was not much to be done in the way of education at this season of the year; and Sutherland to the school room, where he was busy, all the rest of the morning and part of the afternoon, with Caesar and Virgil, Algebra and Euclid; food upon which intellectual babes are reared to the stature of college youths.
 "David Elginbrod", George MacDonald. 
We'll pour her full of algebra and Latin.
 "Just Patty", Jean Webster.