"Prerelease" means something that happens or is available before the official release or launch of a product or service. It is like a sneak peek or early access to something that is not yet officially available to the general public. Full definition
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Outlets that write negatively about gadgets often don't get prerelease versions of the next gadget. (inc.com)
Testing conducted by Apple in August 2017 using preproduction Apple Watch Series 3 (GPS), preproduction Apple Watch Series 3 (GPS + Cellular), and shipping Apple Watch Series 2, each paired with an iPhone; all devices tested with prerelease software. (apple.com)
Testing conducted by Apple in August 2016 using preproduction Apple Watch Series 1 paired with an iPhone; all devices tested with prerelease software. (apple.com)