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An avocation is an activity that someone engages in as a hobby outside their main occupation. There are many examples of people whose professions were the ways that they made their livings, but for whom their activities outside their workplaces were their true passions in life.
[edit on Wikidata] Avascular necrosis (AVN), also called osteonecrosis, bone infarction, aseptic necrosis, and ischemic bone necrosis, is cellular death (necrosis) of bone components due to interruption of the blood supply. Without blood, the bone tissue dies and the bone collapses. If avascular necrosis involves the bones of a joint, it often leads to destruction of the joint articular surfaces. (see Osteochondritis dissecans).