Final answer:
The best definition of chronic in this context is ongoing. Chronic stress refers to the persistent, long-term stress that an individual experiences.
Step-by-step explanation:
The best definition of chronic in this context is ongoing. Chronic stress refers to the persistent, long-term stress that an individual experiences. It is not a temporary or occasional state, but rather a continuous and prolonged condition. The word 'chronic' is used here to emphasize that the stress is not brief or sporadic, but rather has a lasting impact on mental and physical well-being.
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