A friend suggested I try out his AI app so I asked it to explain Deleuze & Guattari's concept of 'desire'. This is what it told me:

Deleuze & Guattari have a unique take on desire. They see it not as a lack, as traditional psychoanalysis might, but as a positive, productive force. They view desire as something that creates & connects, constantly generating new realities & possibilities, rather than just filling a void. It’s a fascinating concept!

I always suspected it was their word for 'spirit'. Now I know.