Extensional properties, e.g. extensional equality, relate to the "black-box" behaviour of an object, i.e. how its output depends on its input. The opposite is intensional which concerns how the object is implemented.

In addition suitable contents:
[ al ] [ an ] [ at ] [ av ] [ b ] [ be ] [ bj ] [ bo ] [ box ] [ ch ] [ ck ] [ co ] [ con ] [ de ] [ E ] [ ec ] [ ed ] [ eh ] [ er ] [ es ] [ extension ] [ extensional equality ] [ h ] [ ie ] [ in ] [ input ] [ int ] [ intensional ] [ io ] [ is ] [ it ] [ la ] [ li ] [ mp ] [ na ] [ nc ] [ np ] [ ns ] [ object ] [ op ] [ output ] [ pe ] [ pl ] [ pr ] [ quality ] [ re ] [ ro ] [ si ] [ sit ] [ T ] [ th ] [ to ] [ tp ] [ ua ] [ vi ]