Fetch is simply the length of water over which the wind has blown. It is used in geography and is usually associated with coastal erosion. It plays a large part in Longshore Drift too.

Example: The winds which travel from the East coast of America and hit the west coast of Ireland would have an extremely large fetch.

Fetch is a ball game played amongst two people. It is stereotypically played amongst fathers and sons, or a dog and its owner.

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In Computer architecture, fetch is also a pipeline stage of a processor. It fetches instructions from a memory or cache and feeds them to the rest of the pipeline.