the act of sending out gas, heat, light, etc. for a second, third, etc. time, or an amount of gas, heat, light, etc. that is sent out for a second, third, etc. time

The blinds are positioned away from the occupants to reduce re-emission of heat and allow diffuse daylight to enter the building.

A resonant photon can escape only after several absorptions and reemissions if the plasma has a finite optical thickness for it. 如果等离子体有一个有限的光学厚度，一个共振光子只要经过几次吸收和再发射后就能逃逸。