। ॥ ९०९ ॥
In plain words
Nirvikalpa samādhi: the one movement of mind left in it is stillness itself, and nothing else marks it. That — only that — is what those who really understand the yoga scriptures mean when they say yoga.
Close to the Sanskrit
That nirvikalpa samādhi, which is a mental mode whose defining mark is utter motionlessness — that alone they call 'yoga', those who truly know the meaning of the yoga scriptures.