Timber/ˈtɪmbər/ Definition 1 of 4Pro Tip 1/3Construction Material Timber refers to wood processed for use in building or carpentry. The carpenter ordered more timber for the flooring. Pro Tip 2/3Preparation Required Not all wood is timber; it becomes timber after being cut into specific sizes and treated. After drying and milling, the wood finally became timber. Pro Tip 3/3Quality Matters Different projects require different types of timber, often graded by quality. For the cabinetry, only premium-grade timber will do.