Syntheses meaning : The formation of something complex or coherent by combining simpler things. The reaction of elements or compounds to form more complex compounds. A deduction from the general to the particular. The combination of thesis and antithesis. In intelligence usage, the examining and combining of processed information with other information and intelligence for final interpretation. An apt arrangement of elements of a text, especially for euphony. (grammar) The uniting of ideas into a sentence. The reunion of parts that have been divided.