The definition given in the sentence is a formal definition.
We can arrive at this answer because:
- The sentence shows a lot of information about Jack.
- However, all this information is presented in a summarized form, using as little space as possible.
- For this reason, Jack's description is given in a few lines, even if it is a comprehensive definition.
These features refer to the formal definition, which is very common in short, objective texts because of its straightforward nature.
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