optimism SPRING GREEN tertiary 00FF7F,0,255,127 optimismnounop·ti·mism | \ ˈäp-tə-ˌmi-zəm \Definition of optimism1: a doctrine that this world is the best possible world2: an inclination to put the most favorable construction upon actions and events or to anticipate the best possible outcome Each color has a corresponding gemstone that is correlative to its philosophical meaning and metaphysical purpose.