Webster's English Dictionary

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sector

1. sec.tor \'sek-t*r, -.to.(*)r\ n [LL, fr. L, cutter, fr. sectus, pp. of 
   secare to cut - more at MSAW 1a: a geometrical figure bounded by two radii 
   and the included arc of a cir cle 1b1: a subdivision of a defensive 
   military position  1b2: a portion of a military front  2: a mathematical 
   instrument consisting of two rulers connected at one end  by a joint and 
   marked with several scales 3: a distinctive part (as of an economy) {the 
   industrial ~} 
2. sec.tor \-t*r\ \-t(*-)rin\ vt or sec.tor.ing : to divide into or furnish 
   with sectors