What is the meaning of the word "grace"?

Definitions:

(Christian theology) the free and unmerited favor or beneficence of God noun
- God's grace is manifested in the salvation of sinners
a disposition to kindness and compassion noun
- the victor's grace in treating the vanquished
a sense of propriety and consideration for others noun
- a place where the company of others must be accepted with good grace
a short prayer of thanks before a meal noun
- their youngest son said grace
elegance and beauty of movement or expression noun
- They made subtle movements of unparalleled grace.