The joint that allows movement in only one direction is____

Explanation

**Step-by-Step Solution:**

1. **Understanding Joints**: Joints are the connections between two or more bones in the body. They allow for movement and flexibility.

2. **Types of Joints**: There are various types of joints in the human body, each allowing different types of movement. Some joints allow movement in multiple directions, while others restrict movement to a single direction.

3. **Identifying the Joint**: The question specifically asks for a joint that allows movement in only one direction.

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