Define spermiogenesis.

Explanation

### Step-by-Step Solution:

1. **Definition of Spermiogenesis**: Spermiogenesis is the final stage of spermatogenesis, where round haploid spermatids undergo transformation to become mature, motile spermatozoa.

2. **Context in Spermatogenesis**: Spermiogenesis is a specific phase within the larger process of spermatogenesis, which is the overall process of gamete formation in males.

3. **Origin of Gametes**: The process begins with spermatogonia, which are the initial germ cells in the male reproductive system. These cells undergo mitotic division to form primary spermatocytes.

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