Definitions
from Wiktionary, Creative Commons Attribution/ShareAlike License
 adj. Of or relating to the fifth degree, such as a quintic polynomial which has the form ax5+bx4+cx3+dx2+ex+f (containing a term with the independent variable raised to the fifth power).
 n. a quintic polynomial: ax5+bx4+cx3+dx2+ex+f
from the GNU version of the Collaborative International Dictionary of English
 adj. Of the fifth degree or order.
from The Century Dictionary and Cyclopedia
 Of the fifth degree.
 n. An algebraic function of the fifth degree.
Etymologies
Examples

Specifically, it's the "quintic," one step up from the dread quadratic equation that gives so many kids fits in algebra.

A colleague and I were reading your Dec. 5 article "Analyze These!" about two math geniuses and were astonished by the statement that the "quintic" is "one step up from the dread quadratic equation."

High order end conditions and convergence results for uniformly spaced quintic splines (Technical report/Dept. of Mathematics, University of North Carolina at Charlotte) by Norman F Innes
OpEdNews  Quicklink: Americas  Pilot's gun fired during flight

A quintic function is a function with five in the exponent, and a quadratic function is a function with two in the exponent.

The progression goes from quadratic to cubic to quartic to quintic functions.

Niels Abel (180229) proved that the general quintic cannot be solved by radicals.

Oddly enough, I had made identical calculations thirtyfour years earlier for the colinear EarthMoon Lagrange points ( "Stationary Orbits", Journal of the British Astronomical Association, December 1947) but I no longer trust my ability to solve quintic equations, even with the help of HAL, Jr., my trusty H/P 91OOA.

For example, from stringtheoretic considerations, Candelas, de la Ossa, Green, and Parkes conjectured the correct formula for the number of degree d rational curves in a CalabiYau quintic.

Parksc onjectured the correct formula for the number of degree d rational curves in a CalabiYau quintic.

For example, from stringtheoretic considerations, Candelas, de la Ossa, Green, and Parks conjectured the correct formula for the number of degree d rational curves in a CalabiYau quintic.
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