Kathy,
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what do you want me to say to that?

Here's the point. You agree that the term "the bible" doesn't actually occur within the 66 books of the Old and New testament, right? So when you state:
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I disagree in adding the word ‘trinity’ into the mix, because it is not in the bible.
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Trinity: Not in the Bible
I am merely pointing out that since you have also made use of words (as "the bible") which are not themselves in "the bible", you should not object to the use of a similarly technical, shorthand term ("Trinity") to represent a set of doctrinal statements.

I know you have acknowledged that the "interpretation" of the term is more important, and am suggesting that your understanding of the interpretation--that is, the truth or falsity of the meaning invested in the term compared to the whole counsel of God--is the only issue to be considering, not the usage of the word itself.

In Christ,
Paul S