A flow of water in a channel or bed, as a brook, rivulet, or small river. A steady current in such a flow of water. A steady current of a fluid. A steady flow or succession: a stream of insults. See Synonyms at flow. A trend, course, or drift, as of opinion, thought, or history. A beam or ray of light. Chiefly British A course of study to which students are tracked. To flow in or as if in a stream. To pour forth or give off a stream; flow: My eyes were streaming with tears. To come or go in large numbers; pour: Traffic was streaming by. Fan mail streamed in. To extend, wave, or float outward: The banner streamed in the breeze. To leave a continuous trail of light. To give forth a continuous stream of light rays or beams; shine. To emit, discharge, or exude (a body fluid, for example). Computer Science To transmit (data) in real time, especially over the Internet. on stream In or into operation or production: a new power plant soon to go on stream.