Justification

Though the concept is visible in the OT, the word does not appear in it

It carries, in the noun, the concept of the underlying noun

The Miriam Webster Definition

the act or an instance of justifying something : VINDICATION an acceptable reason for doing something : something that justifies an act or way of behaving : the act, process, or state of being justified by God (see JUSTIFY sense 2a)

The Legal Concept

A change in the way the law looks at an act

The facts have not changed, but the result has changed

The Biblical Concept

Lexham Survey of Theology Justification

Justification is a Christian’s judicial acceptance by God as not guilty because his sins are not counted against him.

Lexham Survey of Theology The Nature of Justification

Justification is the Christian doctrine concerning the manner in which God communicates Christ’s righteousness to believers so that they may stand as righteous before him and gain eternal salvation.

The Concept in the Old Testament

There are a host of Hebrew words—not going to try to pronounce any of them—the carry into the Septuagint as the same word that the NT writers use

The Dominant Greek Word in the New Testament

Some Biblical Uses

Ro. 5.9, 1 Cor. 6.11, Gal 2.16.

BUT....

James 2.21, 24, 25.....