"Bifurcation" itself is the complete word, meaning the act of dividing into two branches.
However, you might see related words with suffixes:
* Bifurcate (verb): To divide into two branches.
* Bifurcated (adjective): Divided into two branches.
* Bifurcation point (noun): The point where something divides into two branches.
Let me know if you had a different question in mind!