Electronegativity is

Explanation

### Step-by-Step Solution:

1. **Definition of Electronegativity**:
Electronegativity (EN) is defined as the tendency of an atom in a molecule to attract the shared pair of electrons towards itself.

2. **Nature of Electronegativity**:
It is important to note that electronegativity is a dimensionless property. This means it does not have units and is a relative measure of an atom's ability to attract electrons in a bond.

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