Umbrella/ʌmˈbrelə/ Definition 1 of 4Pro Tip 1/3Weather Protection Used for personal safety from rain or sunlight, often carried outdoors. Don't forget to take your umbrella—it looks like it might pour today! Pro Tip 2/3Portable Item A compact, foldable accessory easily carried in a bag or hand. He always has an umbrella in his backpack, just in case. Pro Tip 3/3Frequently Forgotten Commonly left behind in public places due to its portability. Oops, I’ve left my umbrella at the cafe again.