(physics, chemistry) The property of certain photochromic materials of colouring in near-ultraviolet light and then fading in its absence; they are used in the lenses of sunglasses

By, toward, or of aggregation (the act of collecting or gathering together).

present participle of stoccade

(music) A music genre with layered soundscapes, dub and hip-hop influences (including the use of samples), and a progressive approach to beat programming.