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
Dr. Baibing Chen, CNBC, 27 May 2025
Veterans can research the GI Bill benefits to pay for college, graduate school and other educational programs for a variety of expenses; requirements vary for eligibility.
—Vicki Salemi, Boston Herald, 25 May 2025
Also, qualified service members can transfer up to 36 months or a portion of their Post-9/11 GI Bill benefits to a spouse or child.
—Crystal Tate, USA Today, 24 May 2025
The sprouting process reduces the digestibility of starch, which lowers the GI of sprouted products, like bread.
—Jillian Kubala, Health, 20 May 2025
See All Example Sentences for gi
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Noun
For instance, common side effects of overusing aspirin, ibuprofen, and other NSAIDs (or nonsteroidal anti-inflammatory drugs) include peptic ulcers, GI bleeding, acute kidney injury, and even chronic kidney disease.
—Dr. Baibing Chen, CNBC, 27 May 2025
Veterans can research the GI Bill benefits to pay for college, graduate school and other educational programs for a variety of expenses; requirements vary for eligibility.
—Vicki Salemi, Boston Herald, 25 May 2025
Also, qualified service members can transfer up to 36 months or a portion of their Post-9/11 GI Bill benefits to a spouse or child.
—Crystal Tate, USA Today, 24 May 2025
The sprouting process reduces the digestibility of starch, which lowers the GI of sprouted products, like bread.
—Jillian Kubala, Health, 20 May 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 31 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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