..........is an example of hinge joint.

Explanation

**Step-by-Step Solution:**

1. **Understanding Hinge Joints**: Hinge joints are a type of synovial joint that allows movement primarily in one direction, similar to the way a door opens and closes.

2. **Identifying Examples**: Common examples of hinge joints include the elbow joint, knee joint, and ankle joint.

3. **Focusing on the Elbow Joint**: The elbow joint is a classic example of a hinge joint. It allows for flexion and extension of the forearm relative to the upper arm.

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