When was the first time the word Trinity was used in Christian writings?

Question

Who and when?

Answer 1

it was the Tertullians in about 200 AD.
try this site:
http://en.wikipedia.org/wiki/Trinity.
myself, i believe that the trinity is a blasphemy against the 1st commandment which saya that there is one god and none shall be before him, not even christ

Answer 2

What is the origin of the Trinity doctrine?
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.

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.”
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."

Answer 3

Elohim, has several alternate meanings.

gods,
Supreme God (not Supreme Gods)
judges
angels

Words in sentences don't have combination of meanings.

Fast in English means to move quickly

Rabbits are fast running animals.

or

Not at all.

The cargo was held fast to the deck.

In Gen.1:26 the translators all all the bibles I've used chose to use "God" not gods in their translation.

So Gen 1:26 means that the Supreme God (Elohim) said to Jesus, (his Son) let us . . .

Why did he phrase it this way? Prov. 8:30 shows that Jesus is Jehovah's Master Worker.

The trinity came about after much arguments and conflict in the 3rd and 4th centuries.

Answer 4

'elohiym -plural intensive - singular meaning

Gen 1:1 in the beginning "'elohiym" created the heavens and the earth.

Granted this is not the word "trinity" but this does reference tha Godhead.