Definitions:

1. A member or former member of the U.S. armed forces. NOUN
   • The film portrayed the life of a G.I. during World War II, highlighting the challenges and camaraderie among soldiers.
2. Abbreviation for 'Gastrointestinal'; refers to the digestive tract and its diseases, treatments, and functions. ABBREVIATION
   • A healthy G.I. tract is essential for proper digestion and nutrient absorption.
3. Of, relating to, or characteristic of U.S. military personnel. ADJECTIVE
   • As a G.I. in the army, he was issued standard equipment for his deployment overseas.

Synonyms:

• digestive
• enlisted man
• gastroenteric
• gastrointestinal
• military man
• serviceman
• Soldier