Webster's English Dictionary

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significant

sig.nif.i.cant \-k*nt\ aj [L significant-, significans, prp. of significare 
   to signify] 1: having meaning; esp : SUGGESTIVE, EXPRESSIVE  2: suggesting 
   or containing a disguised or special meaning  3a: IMPORTANT, WEIGHTY  3b: 
   probably caused by something other than mere chance {statistically (R@ 
   correlation between vitamin deficiency and disease} 3c: essential to the 
   determination of some larger element of a language :: DISTINCTIVE {the 
   difference between the initial sounds of keel and cool is not ~ in English} 
   - sig.nif.i.cant.ly av