In formwork for concrete, a flat, horizontal member at the top and/or bottom of studs or posts. If on the ground, a plate is called a mudsill.
In structural design, a member, the depth of which is substantially smaller than its length and width.
In framing, the top plate (horizontal) connects with the top of wall studs. The floor joists, rafters, or trusses rest on it. The sole plate is at the bottom of wall studs. The still plate (horizontal) rests on and is anchored to the foundation.
A flat rolled iron or steel product. See also flat plate, load-transfer assembly.