What is "coopted"

Usage examples of "coopted".

He had coopted Bayliss, who had once worked with Marsden - and Chen, who was now working with the Interface crew, but had some experience of walking into unknown, unevaluated situations.

What was unusual was that he had been born on Burning Bright, one of the select few who had been coopted for adoption into the hsai kinship system.

Precursor site coopted by Hecate somehow attracted them until it rabbit-holed.