Stability

The state or quality of being stable, or firm; steadiness; firmness; strength to stand without being moved or overthrown; as, the stability of a structure; the stability of a throne or a constitution.

Steadiness or firmness of character, firmness of resolution or purpose; the quality opposite to fickleness, irresolution, or inconstancy; constancy; steadfastness; as, a man of little stability, or of unusual stability.

Fixedness; -- as opposed to fluidity.

the quality of being enduring and free from change or variation; "early mariners relied on the constancy of the trade winds"