what does UPNISHAD literally menas ?

Meaning of 'Upanishad'

The term 'Upanishad' literally means, "sitting down near" or "sitting close to", and implies listening closely to the mystic doctrines of a guru or a spiritual teacher, who has cognized the fundamental truths of the universe. It points to a period in time when groups of pupils sat near the teacher and learnt from him the secret teachings in the quietude of forest 'ashrams' or hermitages. In another sense of the term, 'Upanishad' means 'brahma-knowledge' by which ignorance is annihilated. Some other possible meanings of the compound word 'Upanishad' are "placing side by side" (equivalence or correlation), a "near approach" (to the Absolute Being), "secret wisdom" or even "sitting near the enlightened".