Noah Webster's Dictionary (n.) The state or quality of being firm.

Multi-Version Concordance Firmness (2 Occurrences) Colossians 2:5 For if indeed in the flesh I am absent, yet I am with you in spirit, rejoicing and seeing your order, and the firmness of your faith in Christ. (DBY RSV) Daniel 2:41 And whereas thou sawest the feet and toes, part of potters clay, and part of iron, it shall be a divided kingdom; but there shall be in it of the strength of the iron, forasmuch as thou sawest the iron mixed with miry clay. (See JPS RSV)