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is by far the most popular so I think it should be the only one, with and as synonyms

Administration of a Multi-Tenant Rails App is a classic, with all 3 tags...

A single tag would really help me right now to search for [django] [multi-tenant]

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closed as off-topic by Shadow Wizard, Martijn Pieters, random, ChrisF, doppelgreener Aug 19 '14 at 22:44

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I don't know specifics here, but sometimes identical-looking tags are used for slightly different things (for example similar libraries in different languages). Is this the case here, or are they really synonymous? – Joachim Sauer Dec 13 '12 at 15:54
From what I know of multi-tenant it's simply the adjective (and by far the more common term) for multi-tenancy. In my view they can be safely merged into multi-tenant. uses both terms as noun and adjective for the same concept. – RichVel Dec 13 '12 at 18:22
I'd be inclined to synonymize to multi-tenancy. It's what the Wikipedia article calls it, and multi-tenant is probably popular because it was the first tag created. – Robert Harvey Dec 13 '12 at 19:12
Multi-tenant is a much more common term - started hearing it about a decade ago, whereas multi-tenancy only cropped up for me more recently. So I think multi-tenant is oldest because it's the earlier term, and still current. – RichVel Dec 13 '12 at 21:14