The works of Ādi Śaṅkarācārya

Viṣṇusahasranāmastotram

Verse 386

विविधा कुण्ठा गतेः प्रतिहतिः विकुण्ठा, विकुण्ठायाः कर्तेति वैकुण्ठः; जगदारम्भे विश्लिष्टानि भूतानि परस्परं

In plain words

A blunting of many kinds — motion checked, movement struck back — that is vikuṇṭhā; and the one who does that checking is Vaikuṇṭha. At the world's beginning the elements lay disjoined, each cut off from the others,

Close to the Sanskrit

Manifold blunting, the obstruction of motion, is vikuṇṭhā; the doer of vikuṇṭhā — thus, Vaikuṇṭha. At the beginning of the world, the elements, disjoined from one another,