Although when studying Scripture, I rarely care what a secular dictionary says, the verb quoted above conveys the idea. But, my point is, abiding doesn't have anything to do with maintaining your common salvation (works). Abiding is a family matter.
For instance, take John 15:5: I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.
Abiding, or enduring, creates conditions that will bring forth fruit. It's works. Unless you think that salvation is by works, then this just doesn't quite fit.
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The Greek word that is translated as “saint” is the adjective “hagios”. It means “separated ones” or “holy ones”. As an adjective, it describes or identifies a quality or characteristic of the noun that it modifies.
Mark 6:20: For Herod feared John, knowing that he was a just man and HOLY MAN [hagios = a SAINT; John was not only a just man, but a saint], and observed him; and when he heard him, he did many things, and heard him gladly.
Herod knew that John was a just man and a saint. Herod knew that he was a just man and a holy man by the way John conducted his life; by the way he lived. John was not given this title simply because he was a child of God.
It was given because Herod observed him. Herod observed him and knew that he was living a different kind of life than the normal life of the normal person would live according to lust and the power of sin that dominates the life of a normal human being.
John separated himself and was different and lived a lifestyle that was different. John had a holy lifestyle. You might be sitting there today and thinking, “I fall short of a holy lifestyle.” We all fall short.
A holy lifestyle means that I am separated unto purity. It does not mean that we live a lifestyle that is sinless. John was not deity; he was not God. He was a man, just like you and me. He was not practicing a lifestyle of lawlessness. He was very careful how he lived. He separated himself unto purity. He separated himself from that which was impure unto that which was clean.
So, when we talk about walking after a holy lifestyle, we’re talking about walking after the commandments of God (not talking about legalism, though).
Is this a requirement to being saved?
BTW, in Romans 1:7, they are "called saints", not "called to be saints". Any time you see italics in the KJV, those words are added and are not in the original text. Why are they called saints? Because they lived a holy lifestyle.