In fiction, the extension of a media franchise (i.e. a television show, series of feature films, etc.) with other media (generally comics and original novels), often with the result being that the stories described in the other media are not considered canon in the original.

plural of expanded form

(dated) An alloy that has expanded upon cooling. / Sheet metal that has been slit and stretched at right angles to the slits to form a lattice; used for making screens etc and for reinforcing concrete.