- Of or pertaining to a square, or to squares; resembling
a quadrate, or square; square. - Tetragonal. - Pertaining to terms of the second degree; as, a
quadratic equation, in which the highest power of the unknown quantity
is a square.
Meaning of 'quadratic' (Princeton's WordNet)
1 . quadratic
[ a]
Meaning (1): - involving the second and no higher power of a quantity or degree