Something that is undefined and doesn't have constraints on it to tell it what it is and what it is not; the other side on the coin of infinity. Infinity is endless defined 'something,' while void is infinite unspecified potential, but isn't something yet. The more information something (an event, an object, ect.) has, the closer it gets to infinity, and the closer it gets to none, to closer to void it gets. Things in our lives don't reach either end, with the more 'void' something has, or lack of boundaries, the more potentials or uncertainties it has; and observing something locks things down and makes it further from void.
(This was a ramble of ideas on the spot so it isn't super coherent or reasonable or really well thought out: apologies.)