g.t.c.

or G.T.C.


good till canceled.
good till countermanded.

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British Dictionary definitions for gtc

GTC

abbreviation for

Also: gtc (on a commercial order for goods) good till cancelled (or countermanded)
(in Scotland) General Teaching Council
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