Temporal Science (or just temporal science) was a study to do with temporal engineering, the science of time. It was studies at the Time Lord Academy.
The Time Lady Verika was recruited into the Celestial Intervention Agency by her "mentor in the study of Temporal Science", the Lord Bregos. (GAME: "Player Characters" [+]Part of The Iytean Menace, Loading...{"namedpart":"Player Characters","1":"The Iytean Menace (game)"})
At some point the Twelfth Doctor was sent by Missy to a train station hosting the Temporal Express to tinker with the Ghost Engine. As he was accompanied by Bill Potts, Missy told her that she didn’t think the Doctor would trust her with temporal science. (GAME: All Aboard! [+]Loading...["All Aboard! (episode)"])