g.t.c.

1. good till canceled.

2. good till countermanded.

Also, G.T.C.

* * *

g.t.c.,

1. good till canceled.

2. good till countermanded.

G.T.C. or GTC (no periods),

good till canceled.

* * *

abbr.

■ good till canceled

■ good till countermanded