what do you call it then....if nothing has ever existed before by your definition

Sound exists before any definition can be worded.

if you know something but cannot share that knowledge you are imprisoned by the idea

Knowledge (perceivable inspiration) or idealism (suggested information)...the latter implies shared among partials; while the former implies being a partial share within whole.

Each ones perception implies a share within all perceivable knowledge.

Share (perception within perceivable) or stash (consenting to suggested)...