Source : Webster's Revised Unabridged Dictionary (1913)

Syndrome \Syn"dro*me\, n. [NL., from Gr. ?; sy`n with + ? a
   course, a running.]
   Concurrence. [R.] --Glanvill.

Source : WordNet®

syndrome
     n 1: a complex of concurrent things; "every word has a syndrome
          of meanings"
     2: a pattern of symptoms indicative of some disease