Source : Webster's Revised Unabridged Dictionary (1913)

Scansion \Scan"sion\, n. [L. scansio, fr. scandere, scansum, to
   climb. See {Scan}.] (Pros.)
   The act of scanning; distinguishing the metrical feet of a
   verse by emphasis, pauses, or otherwise.

Source : WordNet®

scansion
     n : analysis of verse into metrical patterns