Hi Jim,
The Greek Fathers spoke Greek. They understood the term as used in their language. The first meaning is : “to find correct, appropriate”; the second meaning is : “to punish”; the third meaning is : to exculpate, exonerate".
To this we must add that the Septuagint (and New Testament) is heavily influenced by the Hebrew language. “Dikaios” (the adjective) means “just” in Greek, but “upright”, “exemplary” or “holy” in Hebrew. Thus St. Joseph is said to be “just”, which in Matthew’s particular context, could be translated as “upright”.
Thus “dikaioo” not only means “exonerated” but “holy”. And, when one reads St. Paul, both meanings come out clearly.
Verbum