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say it: uhm-BREL-uh
umbrella is a noun and adjective meaning "a lightweight handheld collapsible canopy". It carries 4 recorded senses.
military
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”
covering or applying simultaneously to a number of similar items or elements or groups
“an umbrella organization”
“umbrella insurance coverage”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for umbrella come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.