General Definition: 1. An area or a flat extended object located below a flat object or level area, or any thing or any action directly or indirectly associated with this, especially a foundation. As a Noun: 1. The basic idea, attitude, or experience on which a belief or way of life is built. English = foundation. 2. The layers of bricks or concrete below the ground that a building or other structure is built on. English = foundation. 3. The part of something which normally faces towards the ground. English = underside. As a Verb or Adjective: 1. To be located some distance below or underneath something (ie not touching it). English = beneath. 2. To be the cause or basis of something yet at the same time to be hidden or not obvious. English = underlie, (be) underlying. 3.