say it: ig-zas-ur-BAY-shuhn
exacerbation is a noun meaning "action that makes a problem or a disease (or its symptoms) worse". It carries 2 recorded senses.
action that makes a problem or a disease (or its symptoms) worse
“the aggravation of her condition resulted from lack of care”
violent and bitter exasperation
“his foolishness was followed by an exacerbation of their quarrel”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for exacerbation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.