Help - How do you define remission and what truly is NED?

Saw my onc briefly yesterday and he said he no longer has to see me every month. Used words in some combination that came across to me as "You beat this or it looks like you beat it." Questioned the 1 cm in left breast that showed up on last MRI and positive uptake on PET scan in same area. He did not seem concerned but seemed pleased that there was no other sign of BC or mets. Will continue on Herceptin in study. Is this remission or NED? Still a little afraid to mention either out loud. Maybe I am not there yet. How will I know?