I'm curious ........You intentionally overlook that by even that English dictionary definition, it is specifically organizations, substances, or agents in synergy.
Father, Son, and Holy Spirt are not organizations or agents. And with hypostasis translated as persons, then substances is ousios. God is one ousia.
What word do you think specifically needed to be in the definition of examples in order for the word to ever be qualified to be used of GOD??????