Definition of "canned"

Unfortunately, some of the canned code, which Visual C++ gives to you when creating an application, is not CE aware and gives you compile errors.

1998, Dr. Dobb's Journal: Software Tools for the Professional Programmer

The vested owners of all those sun-drenched tract houses may stick around for a while and fight over the region, perhaps thinking that they are reenacting the great historical dramas of the nineteenth century—such is the long-term effect of canned entertainment on the collective imagi­nation.

2005, James Howard Kunstler, chapter 7, in The Long Emergency, page 279

Throughout the evening, Mr. Christie’s admonition about canned lines and rehearsed speeches hovered and seemed to recalibrate how the crowd — and television viewers — processed what Mr. Rubio said (and resaid, over and over).

2016 February 7, Michael Barbaro, “Once Impervious, Marco Rubio Is Diminished by a Caustic Chris Christie”, in The New York Times‎