Necessity/nəˈsesəti/ Definition 1 of 3Pro Tip 1/3Basic Needs Necessity often refers to items or actions required for basic living or well-being. Shelter is a necessity for protection from the environment. Pro Tip 2/3Prioritize Importance Use necessity to express the high priority of something compared to other needs or desires. Education is not just a luxury; it's a necessity. Pro Tip 3/3Cultural Variation What's considered a necessity can differ in various cultures and societies. In colder climates, warm clothing is a necessity.