That's really a VMWare concept and you can find the definition by searching VMWare's site
Reservation
Reservation specifies the guaranteed reservation for a virtual machine. The server allows you to power on a virtual machine only if the CPU and memory reservation is available. The server guarantees that amount even when the physical server is heavily loaded. The reservation is expressed in concrete units (MHz or MB). When resources are not used, the ESX Server host makes them available to other virtual machines.
Reservation defaults to 0. It is often a good idea to specify a reservation to guarantee that the necessary CPU or memory are always available for the virtual machine.
HTH
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www.cisco.com/go/pdihelpdesk
HTH
java
if this helps, please rate