1
: provided by an official U.S. military supply department
GI shoes
2
: of, relating to, or characteristic of U.S. military personnel
3
: conforming to military regulations or customs
a GI haircut
plural GIs or GI's
ˌjē-ˈīz 
: a member or former member of the U.S. armed forces
especially
: a man enlisted in the army
: in a strictly regulation manner
: to clean (something) thoroughly in preparation for or as if for a military inspection
The barracks … were in fine order—they'd been GI'd the night before.—
New Republic
New RepublicExamples of gi in a Sentence
Verb
in preparation for one of her mother-in-law's dreaded visits, she had GI'd the whole house
Recent Examples on the Web
Amber J. Tresca, Verywell Health, 16 May 2025
Thankfully not cancer—just GI issues and lifestyle changes.
—Tom Rogers, MSNBC Newsweek, 30 Apr. 2025
Pretzels Foods made with refined grains and sugars have a higher glycemic index (GI), a food's ability to raise blood sugar levels.
—Lauren O'Connor, Ms, Rdn, Health, 16 Apr. 2025
This may be a sign of bleeding in your GI tract.7
Before taking a magnesium supplement, speak with your healthcare provider.
—Alex Yampolsky, Health, 7 Apr. 2025
See All Example Sentences for gi
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Noun
The patient will drink a solution that microbes in the gastrointestinal (GI) tract metabolize.
—Amber J. Tresca, Verywell Health, 16 May 2025
Thankfully not cancer—just GI issues and lifestyle changes.
—Tom Rogers, MSNBC Newsweek, 30 Apr. 2025
Pretzels Foods made with refined grains and sugars have a higher glycemic index (GI), a food's ability to raise blood sugar levels.
—Lauren O'Connor, Ms, Rdn, Health, 16 Apr. 2025
This may be a sign of bleeding in your GI tract.7
Before taking a magnesium supplement, speak with your healthcare provider.
—Alex Yampolsky, Health, 7 Apr. 2025
See All Example Sentences for gi
Cite this Entry
“Gi.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/gi. Accessed 24 May. 2025.
Copy CitationKids Definition
GI
1 of 2 adjective
: of, relating to, or characteristic of U.S. military forces
GI
2 of 2 noun
plural GIs or GI's
: a member or former member of the U.S. armed forces
Etymology
Adjective
from the abbreviation for galvanized iron used in listing such articles as garbage cans, but mistaken as standing for government issue
Medical Definition
GI
abbreviation1
gastrointestinal
2
glycemic index
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