Dimensional lumber simply means that the lumber is pre-cut to standard sizes. You're probably most familiar with the 2x4, but ...

Instead of buying a set of shelves for your garage, take on a simple DIY project and build heavy-duty, customizable shelves ...

"The 2x4 acts as a guide, so the straighter the 2x4 ... The rule of thumb for air-drying lumber is one year of drying for ...