Webster's English Dictionary

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synchronism

syn.chro.nism \'sin-kr*-.niz-*m, 'sin-\ \.sin-kr*-'nis-tik, .sin-\ n 1: the 
   quality or state of being synchronous : SIMULTANEOUSNESS  2: chronological 
   arrangement of historical events and personages so as to i ndicate 
   coincidence or coexistence; also : a table showing such concurrences - 
   syn.chro.nis.tic aj