Webster's English Dictionary

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compulsion

com.pul.sion \k*m-'p*l-sh*n\ n [ME, fr. MF or LL; MF, fr. LL compulsion-, 
   compulsio, fr. L comp]ulsus, pp. of compellere to compel 1a: an act of 
   compelling : the state of being compelled  1b: a force or agency that 
   compels  2: an irresistible impulse to perform an irrational act