Frontline Posted on 11th November 20151st September 2020 by ThePD (The Project Definition) Frontline means 1) a person who deals directly with customers; 2) the most important or influential position or movement. 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 person. 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.