Opposably

Part of speech: adverb

Definitions

1. In a manner allowing parts to be placed opposite each other for grasping or manipulation, typically referring to digits that move to face one another for holding objects
2. Characterized by the ability to position extremities so that they can face and oppose each other, enhancing grip and manual dexterity
3. Describing the action or quality of being movable or arranged so that parts can directly confront each other, especially in the context of limbs adapted for seizing or handling items

Etymology: "Opposably" is a plain formation: the verb "oppose" with the suffix "-ably" attached, which turns a verb into an adjective (or, as here, an adverb) meaning "in a way that can be done or is capable of being done." Its literal sense is therefore "in a manner that allows opposition," and in its most common use it describes thumbs and other digits that can be swung across the palm to meet the fingertips. "Oppose" itself comes from Old French "opposer," which joins "op-" (a form of "ob-," meaning "against") with "poser," to place. To oppose something is literally to set it against something else, so the word's core image is two things placed facing one another. That physical picture is what makes the anatomical sense feel natural: an opposable thumb is one that is set against the fingers rather than alongside them.

Synonyms: competently, dexterously, skillfully

Antonyms: incompetently, awkwardly