A natural movement of any part of the body that conveys a thought or an emotion or reinforces oral expression defines which of the following communication skills?

The definition provided in the question aligns best with gesturing. Gesturing involves using arm and hand movements to express thoughts, emotions, or to emphasize verbal communication. It is a key aspect of non-verbal communication that complements spoken language, helping to convey meaning more effectively.

Gestures can encompass a wide range of movements, such as waving, pointing, or making specific hand shapes, and these actions often enhance the message being communicated. By using gestures, a speaker can illustrate their points, indicate enthusiasm, or clarify their ideas, making it easier for the audience to understand the intended message.

Body language, while related, encompasses a broader spectrum of non-verbal cues, including posture, facial expressions, and eye contact, which may not specifically focus on hand and arm movements. Posturing refers to maintaining a particular stance or positioning of the body which might not necessarily involve communicative intent. Mimicry involves imitating someone's body language or facial expressions, which is a different concept than using gestures to communicate a thought or emotion. Overall, gesturing stands out as the most direct expression of the definition provided.