-core n combining form (Pop Music) indicating a type of popular music: dancecore. adj combining form indicating the number of processing units working in parallel in a computer: dual-core. Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014