Definition of "mid-size"

mid-size

adjective
not comparable
1. Of intermediate size.
noun
plural mid-sizes
1. A car of intermediate size.
  Quotations
  When Pontiac dropped a 389 into the intermediate Tempest and called it the GTO, the muscle car tide began turning from big bodies to lighter, more nimble midsizes.
  2018, Donald Farr, The Complete Book of Classic Ford and Mercury Muscle Cars: 1961-1973