of the fifth order or degree
• (a.) Of the fifth degree or order. • (n.) A quantic of the fifth degree. See Quantic.
A polynomial or polynomial equation that contains the fifth power of the variable, but no higher power. Niels Abel and Evariste Galois independently proved that although there exist formulae for the general solution of quadratic, cubic, and quartic equations, no such formula exists for quintic equat...
Quin'tic adjective [ Latin quintus fifth, from quinque five.] (Alg.) Of the fifth degree or order. -- noun (Alg.) A quantic of the fifth degree. See Quantic . 
A polynomial equation of degree 5. See also: Quartic.
A polynomial having a degree of 5.