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Hypotension, or low blood pressure, is defined specifically as blood pressure readings lower than 90/60 mmHg. This definition is significant in clinical practice as it helps healthcare professionals identify patients who may be experiencing inadequate blood flow to organs, which can lead to symptoms such as dizziness, fainting, and in severe cases, shock.

Understanding this definition is crucial because it aids in the assessment and monitoring of patients' cardiovascular health, particularly in conditions that may cause hypotension such as dehydration, blood loss, or certain medical conditions. The symptoms associated with hypotension can often lead to serious health implications if not addressed promptly.

The other options provided do not accurately reflect the definition of hypotension. Blood pressure greater than 120/80 indicates a normal or high normal range; normal blood pressure refers to measurements that fall within a healthy range, which typically is considered to be around 90/60 to 120/80. Severe hypertension, on the other hand, indicates extremely high blood pressure, opposing the concept of hypotension entirely. Therefore, the definition of hypotension as blood pressure lower than 90/60 is essential for accurate diagnosis and effective management of cardiovascular health.