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1. A flat thin piece of sawn lumber, usually long and narrow; lumber less than 2 inches thick. 2. A group of persons having supervisory, investigatory, or advisory powers. 3. A sheet of insulating material carrying circuit elements and terminals so that it can be inserted in an electronic apparatus. 4. A flat panel of compressed fibers. 5. A flat panel used for posting bulletins or as a chalkboard.

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