formation Definition

1. The process of forming, making, developing or establishing something.

Thesaurus: development, generation, evolution, establishment, organization, genesis, compilation, emergence, crystallization.
2a. A particular arrangement, pattern or order, particularly of troops, aircraft, players of a game, etc;

Example: flew in formation over the showground
2b. A shape or structure;

Thesaurus: configuration, arrangement, pattern, shaping, format, grouping, structure, design.
2c. as adj.

Example: formation dancing
Example: formation flying
3. geol.
A mass or area of rocks which have common characteristics.