Source : Webster's Revised Unabridged Dictionary (1913)

Elapse \E*lapse"\, v. i. [imp. & p. p. {Elapsed}; p. pr. & vb.
   n. {Elapsing}.] [L. elapsus, p. p. of elabi to glide away; e
   out + labi to fall, slide. See {Lapse}.]
   To slip or glide away; to pass away silently, as time; --
   used chiefly in reference to time.

         Eight days elapsed; at length a pilgrim came. --Hoole.

Source : WordNet®

elapsed
     adj : (of time) having passed or slipped by; "elapsed time"