There are multiple definitions:

1. evolved gas analysis(English)

   • an analytical technique that can characterize weight changes associated with decomposition, oxidation, and any other physical or chemical changes that result in sample weight loss or gain. During the experiment, a transfer system actively moves the gases evolved during these processes to an instrument capable of providing chemical characterization of the volatiles and pyrolysis products
   • DSC, DTA, ICTAC
   • Spectrometry, Transform
   • https://doi.org…4374(98)80015-0

2. estimated gestational age(English)

   • EDD, SGA
   • Obstetrics, Pregnancy
   • https://www.aco…ng-the-due-date
   • https://dx.doi.…000000000002186

3. European Generic Medicines Association(English)

   • Medicines For Europe (formerly EGA) represents the European generic, biosimilar and valued added pharmaceutical industries
   • AESGP, EMA
   • Health care industry, Pharmacology / pharmaceutics
   • https://www.med…sforeurope.com/