Webster's English Dictionary

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basal

bas.al \'ba-s*l, -z*l\ \-e-\ aj 1a: relating to, situated at, or forming 
   the base  1b: arising from the base of a stem {~ leaves}  2a: of or 
   relating to the foundation, base, or essence : FUNDAMENTAL)M 2b: of, 
   relating to, or essential for maintaining the fundamental vital ac tivities 
   of an organism : MINIMAL - ba.sal.ly av