Define one farad.

Explanation

### Step-by-Step Solution:

1. **Understanding Capacitance**:
- Capacitance is defined as the ability of a system to store electric charge. It is a measure of how much charge a capacitor can hold per unit voltage.

2. **Defining the Unit of Capacitance**:
- The unit of capacitance is called a "farad" (F).

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