1. the ability of the thumb to touch the other fingers on the same hand, allowing for grasping
Usage: anatomy; biology
2. the quality of being able to be placed opposite to something else
Usage: general

Examples

• The opposability of the human thumb is what allows us to grip tools effectively.
• Primates are distinguished by the opposability of their thumbs.
• The injury affected the opposability of her thumb, making it difficult to write.
• Scientists study thumb opposability as a key evolutionary advantage.
• The opposability of certain mechanical parts allows for better functionality.
• Without opposability, many fine motor tasks would be impossible.