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Causality was the relationship between cause and effect, and the concept that a cause must precede an effect in relative linear time. (AUDIO: Square One) It was a subject in metaphysics. All philosophical works read by Emily Rutherford assumed that causality always found a way to repair itself. (PROSE: Separation Day)
The Eighth Doctor told Sam Jones that if he learned anything about future Gallifreyan history, causality could be damaged "beyond all conception." (PROSE: Alien Bodies) He later told Badar that he only made small changes to history to prevent causing any major damage to causality. (PROSE: Interference - Book One)
Bernice Summerfield stated that the creation of alternate timelines and other universes off of the main universe tended to "upset Causality's shopping trolly," which is why such deviations needed to be corrected. (PROSE: No Future)