<parallel> Processes cannot execute in parallel if one effects values used by the other. Nor can they execute in parallel if any subsequent process uses data effected by both, i.e. whose value might depend on the order of execution.
Try this search on Wikipedia, OneLook, Google
Nearby terms: Berners-Lee, Tim « Bernoulli Box « Bernoulli principle « Bernstein condition » BERR » Bertrand » Bertrand Meyer