I think that the essence of these all "multi" is that every product of the team will immediately perform many functions.
This is certainly understandable from the meaning of this word. But in the context of the project, such explanations do not clarify anything and create an even more unclear.
Optherium Labs is creating an ecosystem around a modular, Multi-Decentralized Private Blockchains Network that provides fast transactions and instant confirmations utilizing MultiSecure Transactions, Dynamic biometrics These are the the name of techologies how they are pattented in US pattent service.
The wallet is ready you can download it and test all this technologies. It will be better to understand them by test.