Faithfulness means being loyal, reliable, and dedicated to someone or something. It means staying true to your commitments and promises and being consistent in your actions and behavior. Full definition
(And in this case, the comment here in realclimate indeed exposes the lack of faithfulness of the AR (1) model so I won't have to give these examples). (realclimate.org)
Many folks of faithfulness in God need no sons or daughters of God to remain secure in their beliefs of an afterlife. (religion.blogs.cnn.com)
There's a lot to be said for faithfulness in monogamous marriage (which I have not experienced d / t my husband's sexual addiction and flippancy). (nakedpastor.com)