Source : Free On-Line Dictionary of Computing

Multiple Master
     
         (Or "Multiple Master Font") A {font}
        that is a mixture of two or more other fonts.
     
        A Multiple Master font is a single font containing from two to
        sixteen master designs (the current implementation limit).  A
        weight factor specifies the contribution of each master design
        for the creation of a multiple master font {instance}.
     
        A Multiple Master instance is a single {interpolation} of a
        multiple master font as created by a user or application.
     
        {ATM Glossary
       
     (http://www.adobe.com/supportservice/devrelations/typeforum/glossary.html)}.
     
        {Useable fonts
       
     (http://susi.informatik.rwth-aachen.de/Mirror/winsite/win3/fonts_atm.html)}.
     
        (1998-05-31)