The world, realm, or community of artists; the state or domain of being an artist collectively.
From artist plus -dom (suffix meaning 'domain, condition, or people'). Follows the pattern of kingdom, boredom, and official jargon like Christendom.
The -dom suffix is really old—it comes from Old English and means a realm or domain, which is why 'artistdom' literally means 'the kingdom of artists,' just like 'kingdom' means 'the realm of the king!'
Complete word intelligence in one call. Free tier — 50 lookups/day.