Yōga Sūtra 1.51

tasyāpi nirōdhē sarvanirōdhānnirvījaḥ samādhiḥ।

When those imprints (from nirvichara samādhi on adhyātma) are also restrained, everything is restrained, and results in an equilibrium state without the need for a seed.

The wisdom born of nirvichāra samādhi on adhyātma starts unbinding the previous imprints. Then comes a time when no more previous imprints are left. Then one reaches a state where there is complete understanding of adhyātma and there is no need for any seed. Such a state of equilibrium without the need for seed is called - nirvīja samādhi. It is a purely subjective experience without any objects.