Final answer:
The sentence provides an informal definition. Extended, formal, and dictionary definitions differ in detail and precision.
Explanation:
Informal definition is provided in the sentence. An informal definition typically uses everyday language and may not be precise or detailed. In this context, the comparison of a hydrofoil to a boat as being 'much much faster' is a simple, informal way of explaining the concept.
To further explain, an extended definition would provide more detailed information and examples, a formal definition would be precise and technical, and a dictionary definition would offer an exact meaning of the term.
Learn more about definitions in language here:
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