Many are arguing we are not in a bubble because it is different than the last bubble. What defines a bubble? Is it simply that prices drop from a high after sig

Many are arguing we are not in a bubble because it is different than the last bubble. What defines a bubble? Is it simply that prices drop from a high after significantly increasing? If the conditions that they argue are resulting in current prices ease (supply, material, labor shortages are a few listed here), and prices drop, isn't that a bubble? I guess they could simply plateau and return to "normal" growth patterns.