Definitions for "Alpha Testing"
software developer's initial release of a program to test for bugs and to receive feedback. Typically, the alpha test has a large number of errors in it. (See beta testing.)
In-house testing of a software product.
If a new product is released for testing to a company's own employees before exposing it outside the company, then the product is said to be under alpha testing.
Running the programming code through a spell checker.