In the binomial system of nomenclature, the first word indicates the ......... of the organism.

Explanation

**Step-by-Step Solution:**

1. **Understanding Binomial Nomenclature**: The binomial system of nomenclature is a formal method for naming species of living organisms. It was developed by Carl Linnaeus.

2. **Structure of the Name**: In this system, each organism is given a name that consists of two parts. The first part is the genus name, and the second part is the species name.

3. **Identifying the First Word**: The first word in the binomial name indicates the genus of the organism. This is a crucial aspect of the naming system as it groups organisms that are closely related.

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