Stone Posted on 22nd December 20156th May 2021 by ThePD (The Project Definition) A Stone is 1) a hard solid non-metallic mineral matter of which rock is made; 2) refers to the Stone Weight. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in General and tagged word. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.