I had worked as a type setter in a print shop, "justification," had its own meaning in that setting.
I keep my financial records in Excel and I've kept unofficial church financial records (just for newsletter and bulletin purposes - and I like math and graphs) and "justification" has its own meaning in the financial setting.
And of course, for someone who isn't familiar with theological language or typesetting or financial matters, justification has a quite different meaning still--it's the reason, or alleged reason, for doing something.
More specifically, it is showing (or trying to show) that what one did was right or reasonable.
Even within theological circles, justification has more than one meaning. As I recall, and my recollections are not always correct, justification can mean that God declares us righteous (or not guilty) - we are treated by God as righteous but remain sinners; others consider justification as God making us righteous people - God is working in our lives to transform us from sinful to righteous people.
One of the issues with the Lutheran/Roman Catholic
Joint Declaration on the Doctrine of Justification is that there are different understandings of Justification by the church bodies.
As an exercise, we could try to come up with non-jargon words to convey the theological meaning(s) of justification.
To start with, I looked at ways translators/paraphrasers deal with Romans 3:28 where more literal translations have the phrase, "justified by faith." Some of those that use other language:
Amplified: justified and made upright by faith
Common English Bible: treated as righteous by faith
Complete Jewish Bible: considered righteous by God on the ground of trusting
Contemporary English Version: acceptable to God because they have faith
Good News Translation: put right with God only through faith
The Message: God does not respond to what we do; we respond to what God does. We’ve finally figured it
out. Our lives get in step with God and all others by letting him set the pace, not by proudly or
anxiously trying to run the parade.
New English Translation: declared righteous by faith
One of my paraphrases is: "become friends again," slightly longer, "God seeks to make us his friends again."