"Pejoration" is a word that describes the process of becoming worse or deteriorating. When looking for antonyms for this word, one could consider terms that represent improvement or enhancement. Words like "amelioration," "improvement," "growth," "progress," "evolution," "enhancement," "advancement," "development," and "betterment" all represent positive change and would be appropriate antonyms for "pejoration." Alternatively, one could consider words like "stability," "stagnation," "consistency," "steadiness," "permanence," or "unchanging," as these describe situations where conditions remain the same, without any deterioration occurring.