Webster's English Dictionary

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central

1. cen.tral \'sen-tr*l\ \-tr*-le-\ aj [L centralis, fr. centrum center - 
   more at CENTER] 1: containing or constituting a center  2: ESSENTIAL, 
   PRINCIPAL  3: situated at, in, or near the center  4a: centrally placed and 
   superseding separate scattered units {~ h eating} 4b: controlling or 
   directing local or branch activities  5: holding to a middle between 
   extremes : MODERATE  6: of, relating to, or comprising the brain and spinal 
   cord; also :: originating within the central nervous system {~ deafness} - 
   cen.tral.ly av
2. central n : a telephone exchange or operator