broadly, the action or process of combining various elements or parts to form a whole, for example bringing ideas together to form a system or theory, or the system/theory thus formed;
e.g. Her art involves the synthesis of bright colors and creative symbols.
(noun)
the action of producing one chemical substance from others, usually by reacting (combining) simpler substances together but sometimes by breaking down one or more complex substances;
e.g. The factory is involved in the synthesis of fertilizers.
(noun)
(philosophy) a stage at the end of the reasoning process where a new truth or idea resolves the conflicts between ideas presented earlier;
e.g. They had arrived at the synthesis of their thought process.