What is the real origin of the trinity doctrin?

Question

Since the word trinity does not appear in the Hebrew or Greek texts of the bible, where did it originate?

Answer 1

The word "Trinity" comes from "Trinitas", a Latin abstract noun that most literally means "three-ness" (or "the property of occurring three at once"). Or, simply put, "three are one". The first recorded use of this Latin word was by Tertullian in about 200, to refer to Father, Son and Holy Spirit, or, in general, to any set of three things.(Theophilius to Autolycus - 115-181 - introduced the word Trinity in his Book 2, chapter 15 on the creation of the 4th day).
The Greek term used for the Christian Trinity, "Τριάς" (a set of three or the number three),[1] has given the English word triad. The Sanskrit words, "Trimurti or Trinatha," has a similar meaning, as has "Dreifaltigkeit" in German, and many other words in other languages.
The New Testament does not use the word "Τριάς" (Trinity), but only speaks of God (often called "the Father"), of Jesus Christ (often called "the Son"), and of the Holy Spirit, and of the relationships between them. The word "Trinity" began to be applied to them only in the course of later theological reflection.

Answer 2

Please note these references:

rs p. 405 pars. 1-2 Trinity ***
The New Encyclopædia Britannica says: “Neither the word Trinity, nor the explicit doctrine as such, appears in the New Testament, nor did Jesus and his followers intend to contradict the Shema in the Old Testament: ‘Hear, O Israel: The Lord our God is one Lord’ (Deut. 6:4). . . . The doctrine developed gradually over several centuries and through many controversies. . . . By the end of the 4th century . . . the doctrine of the Trinity took substantially the form it has maintained ever since.”—(1976), Micropædia, Vol. X, p. 126.

The New Catholic Encyclopedia states: “The formulation ‘one God in three Persons’ was not solidly established, certainly not fully assimilated into Christian life and its profession of faith, prior to the end of the 4th century. But it is precisely this formulation that has first claim to the title the Trinitarian dogma. Among the Apostolic Fathers, there had been nothing even remotely approaching such a mentality or perspective.”—(1967), Vol. XIV, p. 299.

*** rs p. 406 par. 1 Trinity ***
In The Encyclopedia Americana we read: “Christianity derived from Judaism and Judaism was strictly Unitarian [believing that God is one person]. The road which led from Jerusalem to Nicea was scarcely a straight one. Fourth century Trinitarianism did not reflect accurately early Christian teaching regarding the nature of God; it was, on the contrary, a deviation from this teaching.”—(1956), Vol. XXVII, p. 294L.

(Romans 15:4-6) . . .” 4 For all the things that were written aforetime were written for our instruction, that through our endurance and through the comfort from the Scriptures we might have hope. 5 Now may the God who supplies endurance and comfort grant YOU to have among yourselves the same mental attitude that Christ Jesus had, 6 that with one accord YOU may with one mouth glorify the God and Father of our Lord Jesus Christ.

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How Did the Trinity Doctrine Develop? @
http://www.watchtower.org/library/ti/article_04.htm