1. Information that is essential to understanding a situation or problem
   - background

Type of: information

• lenify
• Lenin
• Leningrad
• Leninism
• Leninist
• lenis
• lenitive
• lenity
• Lennoaceae
• Lennon
• Lennox Robinson
• leno
• lens
• lens cap
• lens capsule
• lens cortex
• lens cover
• Lens culinaris
• lens hood
• lens implant
• lens maker
• lens nucleus
• lens of the eye
• lens system
• lense