Eloquence (noun)

1. The ability to speak or write well and in an effective way.
2. The ability to speak or write well and persuasively.
3. The ability to express oneself well in speech or writing.

Origin:

Late middle english: from old french eloquence, from latin eloquentia, from eloquent- "eloquent", from eloqui "speak well".

Examples:

1. His eloquence was such that he could move the audience to tears or laughter.
2. The lawyer's eloquence was instrumental in winning the case.
3. The politician's eloquence was key in winning the support of the people.
4. The preacher's eloquence was able to inspire the congregation.
5. Her eloquence was evident in the way she was able to express herself in any situation.