Please cite in Scripture where the word "trinity" appears.
You see I don't need to. I don't adhere to a 16th Century heresy that says that unless something is explicitely explained, by name, in scripture, that it is invalid.
That would be in St. Scofield's Inspired Margin Notes:
Mat 3:16 -
Jesus
For the first time the Trinity, foreshadowed in many ways in the Old Testament, is fully manifested. The Spirit descends upon the Son, and at the same moment the Father's voice is heard from heaven.