Accretion Posted on 1st November 20155th June 2021 by ThePD (The Project Definition) Accretion is the mechanism that is a gradual increase or growth by the accumulation of new layers or parts. 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 Technology and tagged geology. 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.