'Eyewitness' definitions:

Definition of 'eyewitness'

From: WordNet
noun
A spectator who can describe what happened
verb
Be present at an event and see it with one's own eyes

Definition of 'Eyewitness'

From: GCIDE
  • Eyewitness \Eye"wit`ness\, n. One who sees a thing done; one who has ocular view of anything. [1913 Webster]
  • We . . . were eyewitnesses of his majesty. --2 Pet. i. 16. [1913 Webster]