Webster's English Dictionary

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posterior

1. pos.te.ri.or \pa:-'stir-e--*r, po--\ aj [L, compar. of posterus coming 
   after, fr. post after - more at MPOST- 1a: later in time : SUBSEQUENT  1b: 
   logically consequent  2: situated behind : as  2a: CAUDAL  2b: DORSAL - 
   used of human anatomy  of a plant part  3: ADAXIAL, SUPERIOR  - 
   pos.te.ri.or.ly av
2. posterior n : the hinder parts of the body; specif : BUTTOCKS