Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia. counterpart. n. in the law of contracts, a written paper which is one of several documents which constitute a contract, such as a written offer and a written acceptance. Often a contract is in several counterparts which are the same but each paper is signed by a different party, particularly if they are in different localities.
dimension lumber. Joists, planks, rafters and other standard commodity lumber that usually range in width from 1 to 2 inches, in thickness from 2 to less than 5 inches, and in length from 3 to 12 feet. quality process
Definitions (2) 1. A piece of lumber two or four inches thick and six or more inches wide, used horizontally as a support for a ceiling or floor. Also, such a support made from steel, aluminum, or other material. See also random lengths. 2. Parallel beams of lumber, concrete, or steel used to support floor and ceiling systems. Picture of joist.