(of a note) increased to one and three quarters of its original time value by the addition of two dots
(of a rhythm) characterized by pairs of notes in which the first one, lengthened by two dots, makes up seven eighths of the time value of the pair
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for double-dotted
Compare these "pot-hooks and trammels," dotted and double-dotted, with Galin's symbol of silence, the cipher !