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Definition of watt. : the absolute meter-kilogram-second unit of power equal to the work done at the rate of one joule per second or to the power produced by a current of one ampere across a potential difference of one volt : 1â746 horsepower.
Noun. 1. tenesmus-painful spasm of the anal sphincter along with an urgent desire to defecate without the significant production of feces; associated with irritable bowel syndrome. cramp, muscle spasm, spasm-a painful and involuntary muscular contraction. Translations.