Webster's English Dictionary

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inertia

in.er.tia \in-'*r-sh*, -she--*\ \-sh*l\ n [NL, fr. L, lack of skill, fr. 
   inert-, iners] 1a: a property of matter by which it remains at rest or in 
   uniform motion i n the same straight line unless acted upon by some 
   external force 1b: an analogous property of other physical quantities (as 
   electricity)  2: indisposition to motion, exertion, or change : INERTNESS  
   - in.er.tial aj