1. A method or plan chosen to bring about a desired future, such as achievement of a goal or solution to aproblem. 
2. The art and science of planning and marshalling resources for their most efficient and effective use. The term is derived from the Greek word for generalship or leading an army. See also tactics. 
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USAGE EXAMPLE

The international market is currently four times the size of the American one and growing, making it an essential part of any company's expansion strategy.