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dimensional lumber

(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 (

dɪˈmɛnʃənəl ˈlʌmbɚ191 viewsLast reviewed Jun 29, 2026+ Add a definition
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#1·Apr 27, 2026

(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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