The meaning of the Acronym M4 is...

M4 is

• ICH M4 Expert Working Group (EWG) [focusing on Common Technical Documents for sections of the NDA]

More Meanings For M4:

• M4 preprocessor file (unix)
• macro processor version 4
• ICH M4 Expert Working Group (EWG) [focusing on Common Technical Documents for sections of the NDA]

M4 is also in:

• FDA
• File Extensions
• Unix Commands