Poise (noun)

1. A state of balance or equilibrium.
2. A person's bearing or manner, especially as it reveals confidence and self-control.

Origin:

From middle english pois, from old french pois, from latin pensum ("weight, measure"), from pendere ("to weigh").

Examples:

1. She walked across the tightrope with poise and grace.
2. He had the poise of a seasoned professional.
3. The dancer had poise and control.
4. She had a natural poise and elegance.
5. He was able to maintain his poise even under pressure.