Antonyms for Decline (opposite meaning)
WordNet sense 1 (a condition superior to an earlier condition):
improvementWordNet sense 2 (an upward slope or grade (as in a road)):
acclivity, ascent, climb, raise, rise, upgradeWordNet sense 3 (receive willingly something given or offered):
accept, have, take, haveWordNet sense 4 (get better):
better, improveFrom the ODE community, based on WordNetadd/edit