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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Co·lum·ni·a·tion n. The employment or arrangement of columns in a structure.
 fifth columnist see fifth columnist in the vocabulary.
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From: WordNet (r) 2.0

 fifth columnist
      n : a member of a clandestine subversive organization who tries
          to help a potential invader [syn: saboteur]