The process of combining two separate elements into one new element.
syn·the·size (sĭn'thĭ-sīz') v. syn·the·sized, syn·the·siz·ing, syn·the·siz·es v. tr. To combine so as to form a new, complex product: "His works synthesize photography, painting and...
To synthesize ideas is to create new ideas from existing ones.
It means to mix the items together to make a new item.
it means...that you mean what you mean:)