(1):

(v. i.) To shine with an intermitted or a broken, quavering light; to flash at intervals; to sparkle; to scintillate.

(2):

(v. i.) To open and shut the eye rapidly; to blink; to wink.

(3):

(n.) A brief flash or gleam, esp. when rapidly repeated.

(4):

(n.) A closing or opening, or a quick motion, of the eye; a wink or sparkle of the eye.

(5):

(n.) The time of a wink; a twinkling.