Sentience

Sister Corvin wrote a thesis entitled "The Echo of Life", concerning the migration of sentience. (TV: New Earth) According to Jingo Linx, the variety of sentient life forms was infinite. (TV: The Time Warrior)

According to Rafando, all sentient beings had an entry in the Fatality Index. (TV: Extremis)

As recalled by Kenossium, the Moment was a weapon so powerful that its operating system became sentient. (TV: The Day of the Doctor)

The Headless Monks payed Dorium Maldovar in sentient money. (TV: Prequel (A Good Man Goes to War))

House was a sentient asteroid. (TV: The Doctor's Wife)