Specifically, Word is that persona which embodies the focus and expression of God’s conceptions. It was the aspect of Word which actually brought into being the Second-Generation Creation when God created, as God created through speaking. Word is linked with the expression of language in more human terms, but functions on levels far beyond that.
The Word persona also separated out from God to actually physically incarnate throughout Creation as living beings. This was for the apparent purpose of teaching various species of the Divine Plan, nurturing closer relationships between those entities and God as a whole, and to then die in order to save all life from their sins. See Jesus Christ.
This was then the basis for the Trinitarian aspect of God. God is also often referred to as the Creator-Word-Spirit in honor of this fact.
- Wikipedia Article on the Word (Logos)