(chiefly, North America) Lumber that is finished (milled or planed) and cut to standardized width and depth; in some countries the nominal sizes differ from the actual sizes in well-established ways (
(chiefly, North America) Lumber that is finished (milled or planed) and cut to standardized width and depth; in some countries the nominal sizes differ from the actual sizes in well-established ways (for example, in the United States, a two by four is nominally 2 inches by 4 inches and is actually 1½ by 3½ inches).
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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(chiefly, North America) A length of sawn wood of cross section nominally 2 inches by 4 inches (actual dimensions 1½ × 3½ in modern use), most often employed as structural framing lumber (dimensional lumber).
(North America) Wood sawn into planks or otherwise prepared for sale or use, especially as a building material.
(North America, mostly, in the plural) A forest from which wood is cut.
(Australia, UK, NZ) A length of sawn wood of cross section 4 inches by 2 inches, most often employed as structural framing lumber / timber.
(chiefly, North America, dated) A small, modest building.