To determine which definition of "acute" best fits how the word is used in paragraph 1, we would need to see the paragraph itself. However, based on the definitions provided, here's a general guideline on how to choose the correct definition:
- If the context involves something that is urgent or intense, then Definition 1 (sharp or severe) may apply.
- If the context relates to someone's ability to notice or understand things quickly, then Definition 2 (keenly perceptive) would be appropriate.
- If the context involves angles or geometric discussions, then Definition 3 (less than ninety degrees) is relevant.
- If the context pertains to sound or musical notes, then Definition 4 (high in pitch) is fitting.
Please provide paragraph 1 for a more accurate identification of the correct definition.