What is the term for showing unusually early development, especially in mental aptitude?

The term that describes showing unusually early development, particularly in mental aptitude, is "precocious." This word is often used to refer to children or individuals who demonstrate advanced abilities or intelligence at a young age, such as being able to read, solve complex problems, or engage in sophisticated conversations before their peers. The root of the word suggests a notion of "ripening" or developing earlier than expected.

In the context of childhood development, a precocious child might display skills or interests that are markedly advanced compared to their age group, leading to a unique set of educational and social experiences. This phenomenon can apply to various areas, including intellectual capabilities, artistic talents, or emotional maturity, indicating a significant departure from typical developmental milestones.