Noun
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having the function of uniting a group of similar things
"the Democratic Party is an umbrella for many liberal groups"
"under the umbrella of capitalism"
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a formation of military planes maintained over ground operations or targets
"an air umbrella over England"
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a lightweight handheld collapsible canopy
Adjective
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covering or applying simultaneously to a number of similar items or elements or groups
"an umbrella organization"
"umbrella insurance coverage"