Webster's English Dictionary

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basic

1. ba.sic \'ba--sik\ \-si-k(*-)le-\ aj 1: of, relating to, or forming the 
   base or essence : FUNDAMENTAL  2: constituting or serving as the basis or 
   starting point  3a: of, relating to, containing, or having the character of 
   a base  3b: having an alkaline reaction  of rocks  4: containing relatively 
   little silica  5: relating to or made by a basic process  - ba.si.cal.ly av
2. basic n : something that is basic : FUNDAMENTAL