An '''ebit''' is one unit of [[bipartite]] entanglement, the amount of entanglement that is contained in a maximally entangled two-qubit state ([[Bell state]]).
If a state is said to have X ebits of entanglement (quantified by some [[entanglement measure]]) it has the same amount of entanglement (in that measure) as X Bell states.
If a task requires Y ebits, it can be done with Y or more Bell states, but not with fewer.
Maximally entangled states in ''d × d'' dimensions have log2(''d'') ebits.
