Dimensional divide

From Tardis Wiki, the free Doctor Who reference

The "dimensional divide" was a term used by the Seventh Doctor and the Reborn Master that referred to the space between dimensions. The Doctor compared it to the insulation between walls. The Dimensioneers created interdimensional corridors that crossed the divide, though they deteriorated over the ages. (AUDIO: Dominion)

How the divide relates to the space between universes is unknown.