1. (n.) The act rendering more violent or bitter; the state of being exacerbated or intensified in violence or malignity; as, exacerbation of passion.

2. (n.) A periodical increase of violence in a disease, as in remittent or continuous fever; an increased energy of diseased and painful action.

accelerando acceleration aggravation agitation amplification animation annoyance arousal arousing augmentation beefing-up blowing up blowup chafe concentration condensation consolidation contentiousness deepening deliberate aggravation deterioration electrification embittering embitterment enhancement enlargement exaggeration exasperation excitation excitement exhilaration explosion fomentation fret gall galvanization heating-up heightening incitement increase inflammation information explosion infuriation intensification irritant irritation lathering up magnification perturbation pickup population explosion provocation redoubling reinforcement sharpening souring speedup steaming up step-up stimulation stimulus stirring stirring up strengthening tightening whipping up working up worsening