Webster's English Dictionary

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exert

ex.ert \ig-'z*rt\ vt [L exsertus, pp. of exserere to thrust out, fr. ex- + 
   sere]re to join 1a: to put forth (as strength)  1b: to put (oneself) into 
   action or to tiring effort  2: to bring to bear esp. with sustained effort 
   or lasting effect  3: EMPLOY, WIELD