umbrella definition

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