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
Vinod Sreeharsha, Miami Herald, 5 Mar. 2025
Advising the company is Transformers and GI Joe producer Lorenzo di Bonaventura.
—Dade Hayes, Deadline, 4 Mar. 2025
One common reaction to those unpleasant GI symptoms is to avoid particular foods or food groups, such as dairy or gluten, McConville says.
—Cindy Kuzma, SELF, 3 Mar. 2025
About 90% of the mood-boosting hormone and neurotransmitter serotonin is produced in the gastrointestinal (GI) tract, making a healthy gut important for its production.
—Heather Jones, Verywell Health, 26 Feb. 2025
See All Example Sentences for gi
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Noun
In the 1950s, the Mackle brothers built distinct but simple homes, many purchased by World War II veterans using GI bill benefits.
—Vinod Sreeharsha, Miami Herald, 5 Mar. 2025
Advising the company is Transformers and GI Joe producer Lorenzo di Bonaventura.
—Dade Hayes, Deadline, 4 Mar. 2025
One common reaction to those unpleasant GI symptoms is to avoid particular foods or food groups, such as dairy or gluten, McConville says.
—Cindy Kuzma, SELF, 3 Mar. 2025
About 90% of the mood-boosting hormone and neurotransmitter serotonin is produced in the gastrointestinal (GI) tract, making a healthy gut important for its production.
—Heather Jones, Verywell Health, 26 Feb. 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 9 Mar. 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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