To Plate : to record a photograph on any medium. From historical use of cut to size glass plates as a substrate or carrier medium for lightsensitive emulsion.
Term used in the gym to indicate a 45-pound weight, used on an olympic barbell. Additionally, the term plate can be used to indicate another weight, when preceded by the number.
Ex1: Im benching 315 now! That's three plates on each side! ( 6x45 + 45 lb. bar )
Ex2: I bought a couple of 25 lb. plates for my home gym.
Something flat that you can't live in. You can eat on it or just look at it. It's not nice to throw a plate on someone you like. But it's okey to throw it on someone you don't like.