Define hierarchy.

Explanation

**Step-by-Step Text Solution:**

1. **Understanding the Concept**: Begin by grasping the basic idea of what hierarchy means. It refers to a system of organization where entities are ranked one above the other based on certain criteria.

2. **Definition**: Define hierarchy as a sequential arrangement of ranks or categories. This means that items or entities are organized in a specific order, where each level has a different status or importance.

3. **Characteristics of Hierarchy**:
- **Sequential Arrangement**: The elements are arranged in a specific sequence, indicating a progression from one level to another.
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