The first occurrence.
These are the generations of Noah: Noah was a just man and perfect in his generations, and Noah walked with God. Gen 6:9
The primitive root.
Strong’s H8549 tamiym, an adjective meaning, “perfect;” from Strong’s H8552 תמם tamam, a primitive root meaning, “to be complete.” The 3-letter root is tav + mem + mem .
tav ת = crossed sticks, thus mark, sign, signal, monument
mem מ, ם = the water, thus chaos, mighty, blood
mem מ, ם = the water, thus chaos, mighty, blood
The story: The cross (tav) covered by the mighty (mem) blood (mem) of Yeshua finishes and makes complete.
how was the story of this word told before the crucifixion?
do we know the context of how the ancient hebrews perceived perfection?
The parables of many Hebrew root words are prophetic. In fact, Yeshua said that Moses wrote about Him (Joh 5:46). As for ancient Hebrew context, you can start with the Ancient Hebrew Lexicon to begin a study on that topic.