full-grown

This term emphasizes the completion of a biological growth cycle, signaling that an organism has reached its maximum physical dimensions. It is frequently used in zoological contexts to distinguish adults from juveniles or seedlings, focusing on the physical manifestation of maturity rather than just chronological age.

When applied to humans, the word shifts from a purely biological description to a social and psychological one. It often carries a connotation of autonomy and responsibility, suggesting that the individual possesses the maturity and legal standing of an adult.