Which of these words does not mean many poly mega multi?

Here's why:

* Poly means "many" or "multiple" (e.g., polygon, polytheism)

* Mega means "large" or "very large" (e.g., megaphone, megabyte)

* Multi means "many" or "multiple" (e.g., multi-tasking, multi-colored)

* Many is the direct synonym of "many".