Define coordination polyhedron.

Explanation

### Step-by-Step Solution:

1. **Definition of Coordination Polyhedron**:
A coordination polyhedron is defined as the special arrangement of ligands or atoms around a central metal ion in a three-dimensional space.

2. **Spatial Arrangement**:
The arrangement is geometric in nature, meaning it can be visualized in a 3D format. This arrangement is crucial in determining the properties and reactivity of coordination compounds.

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