What does the term Upanishad mean?
The term means knowledge
received by the student ‘sitting close to’ the teacher. Education involving the
student ‘sitting close to’ the teacher means the most intimate student-teacher
communion. The higher the knowledge sought, greater is this communion and
greater the silence accompanying the knowledge-communication.
These values reach their
maximum when the knowledge that is sought and imparted is of the highest kind,
namely, atmajnana or brahmajnana, knowledge of the Atman or Brahman.
Reference: The Message of the Upanishads by Swami Ranganathananda (p.12,13)