That which is required for continued existence or function.
Blood that is needed for continued life; blood regarded as the seat of life.
The overall form or organization of something.
The underlying shape of a solid.
Underwater terrain or objects (such as a dead tree or a submerged car) that tend to attract fish
A body, such as a political party, with a cohesive purpose or outlook.
A cohesive whole built up of distinct parts.
A set along with a collection of finitary functions and relations.
Several pieces of data treated as a unit.
A set of rules defining behaviour.
To give structure to; to arrange.