Definition of "sentient"

Not even a microbe? I don't want to blow up something that could evolve into a sentient species in a couple of billion years.

2002, André Bormanis, “Silent Enemy”, in Star Trek: Enterprise, season 1, episode 12, spoken by Jonathan Archer

Lemoine has been placed on “paid administrative leave” after publishing a transcript of conversations with LaMDA which he claims support his belief that the chatbot is sentient and comparable to a seven- or eight-year-old child. […] While Lemoine no doubt genuinely believes his claims, LaMDA is likely to be as sentient as a traffic light.

2022 June 14, Toby Walsh, “Labelling Google’s LaMDA chatbot as sentient is fanciful. But it’s very human to be taken in by machines”, in The Guardian‎

After more than 25 years as an artificial intelligence researcher […] Dr. Goertzel knew he had finally reached the end goal: Desdemona, a machine he had built, was sentient. But a few minutes later, he realized this was nonsense.

2022 August 5, Cade Metz, “A.I. Is Not Sentient. Why Do People Say It Is?”, in The New York Times‎

The merpeople and the sentients who lived on the beach often hitched rides on these creatures, steering them by pressure on exposed nerve centers.

1965, Philip José Farmer, The Maker of Universes