Final answer:
Time zero in stroke refers to the time when the patient is first assessed by the stroke team, marking the beginning of the evaluation process.
Step-by-step explanation:
Time zero in the context of stroke refers to the time when the patient is first assessed by the stroke team. It is the initial point at which the medical professionals begin to evaluate the patient's condition and determine the appropriate course of action for treatment. This assessment is important for timely intervention, as early treatment can significantly improve outcomes for stroke patients.