Define hypertension.

Explanation

**Step-by-Step Solution:**

1. **Definition of Hypertension**:
- Hypertension is defined as a medical condition characterized by consistently high blood pressure in the arteries.

2. **Understanding Blood Pressure**:
- Blood pressure is the force exerted by circulating blood on the walls of blood vessels, particularly arteries. It is measured in millimeters of mercury (mmHg).

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