1. A disorder of voluntary movement consisting of impairment of the performance of skilled or purposeful movements, notwithstanding the preservation of comprehension, muscular power, sensibility, and coordination in general; results from acquired cerebral disease.
2. A psychomotor defect in which the proper use of an object cannot be carried out although the object can be named and its uses described.
The definition information for apraxia is provided by Stedman's. You can search our medical dictionary here.