n. The act of one who or that which twinkles; especially, a quick twitching or fluttering movement of the eye; a wink.n. The phenomenon of scintillation of the fixed stars, consisting of fluctuations of light and of color at the rate of from fifty to a hundred per second. ;n. The time required for one twinkle or wink, as of the eye; a flash; hence, a very short time.