Several times throughout the scriptures, Christ prayed to the Father. I would submit to you, that the Father, Spirit and Jesus, are three parts of the same Deity, not necessarily three jobs. Had you read my whole post you would have seen the reasoning for this pattern of thought, as well as the scriptural backing.
Jesus, Jehovah and the Holy Spirit are three separate entities that always work in perfect union. While the word "Trinity" is not in the New Testament, the concept is. The best place to see it is in Matthew 3:16-17. The setting is the baptism of Jesus. Notice how all three entities are manifested at the same time but in three different places. Jesus is coming up out of the water, the Holy Spirity is descending as a dove, and Jehovah is speaking from heaven.
And by the way....ALL the words we use "found" in the bible are TRANSLATIONS, and as such do not EXACTLY mean what the original inspired text means. This is why serious bible scholars must study Hebrew and Greek. Hence, NONE of our English words are found in the bible...they are English meanings for the meanings of words actually there.
There are all kinds of terms "made up by men" (biblically faithful Christians, usually) as a shortcut terms for ideas present in the bible. The word "trinity" was coined by faithful Christians for the concept clearly taught in scripture as God being one in essence and also three in persons.
As much as can be understood of this mysterious concept was hammered out by our historical Christian forebearers: The Father is not the Son and the Father is not the Spirit; but the Father is God. The Son is not the Father, the Son is not the Spirit; but the Son is God. The Spirit is not the Father, the Spirit is not the Son; but the Spirit is God. This concept of God, uniquely Christian, cannot be fully understood or explained rationally, only certain truths to it can be understood...the rest is mystery, yet to be accepted by all Christians.
The article above too, while a good try, falls short (as any explanation must) of describing the the trinitarian nature of God. As finite beings, our body, mind and spirit all had a beginning...God does not. Our spirit too is not everywhere all the time. God is. Our knowlege and awareness is extremely limited...God's is not. Better to accept that God is one and God is 3 persons, then to try to explain it...no matter how you try, your explanation will miss the mark.
Here is the classic illustration (attempting) to (partly) explain the trinitarian nature of God:
I must admit, when I hear the (usually somewhat lazy) interpretive technique of "God told me" explanations of complex concepts in the bible (and none is more complex than the concept of the Trinity) I too get suspicious. God gave us each a mind, and expects us to use it--filled and guided with the Holy Spirit, yes, but not breezily spouting "God showed me," instead of intensely studying scripture, our only absolute authority, and what other Christians have discovered too. With the exception of specific visions, that kind of attitude is NEVER found in biblical authors, as far as I can see.