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quadratic
From The Collaborative International Dictionary of English v.0.48:
Quadratic \Quad*rat"ic\, a. [Cf. F. quadratique.]
[1913 Webster]
1. Of or pertaining to a square, or to squares; resembling a
quadrate, or square; square.
[1913 Webster]
2. (Crystallog.) Tetragonal.
[1913 Webster]
3. (Alg.) Pertaining to terms of the second degree; as, a
quadratic equation, in which the highest power of the
unknown quantity is a square.
[1913 Webster]
