Appearing or developing early, often used of flowers which appear before the leaves.
Unusually developed.
Early development.
More physically or mentally developed than is usual for a specific age.
To earlier-than-expected development of physical or mental abilities (e.g., precocious dentition, eruption of deciduous or permanent teeth at an age earlier than expected).
Achieving mental or physical development earlier than expected.
Maturing or occurring at an age that is younger than typical.