Webster's English Dictionary

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ulterior

ul.te.ri.or \.*l-'tir-e--*r\ aj [L, farther, further, compar. of (assumed) 
   L ulter situated beyond, fr. (Xuls beyond; akin to L ollus, ille, that one, 
   OIr indoll beyond 1a: FURTHER, FUTURE  1b: more distant : REMOTER  1c: 
   situated on the farther side : THITHER  2: HIDDEN, LATENT {~ motives}  - 
   ul.te.ri.or.ly av