alpha version

/AE1 L F AH0 V ER0 ZH AH0 N/
noun
  1. 1

    An early version of a program or application, typically unstable, but useful to show what the product will do. Sometimes this stage is referred to as a preview version. Sometimes no more features are added after this release, but bug fixes continue. This release comes after a pre-alpha version and before a beta version. As opposed to a beta version an alpha version is usually not feature complete.

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Source: https://en.wiktionary.org/wiki/alpha%20version