Define the term amplitude.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Concept of Amplitude**:
- Amplitude refers to a specific characteristic of waves, particularly sound waves. It is essential to grasp what it represents in the context of wave motion.

2. **Defining Amplitude**:
- Amplitude is defined as the maximum displacement of the particles of the medium from their mean (or rest) position. This means it measures how far the particles move from their average position when a sound wave passes through the medium.

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