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From The Collaborative International Dictionary of English v.0.48:
Vehemence \Ve"he*mence\, n. [L. vehementia: cf. F. v['e]h['e]mence.] [1913 Webster] 1. The quality or state of being vehement; impetuous force; impetuosity; violence; fury; as, the vehemence of the wind; to speak with vehemence. [1913 Webster] 2. Violent ardor; great heat; animated fervor; as, the vehemence of love, anger, or other passions. [1913 Webster] I . . . tremble at his vehemence of temper. --Addison. [1913 Webster]