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                                    Answer» What is Major Indoor Soccer League mean?  Major Indoor Soccer League has been the name of three different American professional indoor soccer leagues: Major Indoor Soccer League (1978–1992), known in its final two seasons as the Major Soccer LeagueMajor Indoor Soccer League (2001–2008), founded by former NPSL teams and later joined by WISL teamsMajor Indoor Soccer League (2008–2014), known as the National Indoor Soccer League in 2008 and adopted the MISL name in 2009. In 2014, several MISL teams joined the Professional Arena Soccer League, which changed its name to the MASL. reference 
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