Final answer:
Tachycardia is defined as a heart rate higher than the normal resting heart rate, often defined as greater than 100 beats per minute.
Step-by-step explanation:
Tachycardia is defined as a rapid heartbeat, with a heart rate higher than the normal resting heart rate. In a clinical setting, tachycardia is often defined as a heart rate higher than 100 beats per minute. This means that when a person's heart beats at a rate of more than 100 times per minute, they are said to be experiencing tachycardia. For example, if someone's heart rate is measured at 110 beats per minute, they would be diagnosed with tachycardia.
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