The #define statement defines a macro, an identifier mapped to be a different value. Note that ScriptEase does not support parameterized macros. This object's members are the defined macros, the value of the members are strings that are what the macro is defined to be. In other words, if you have this statement:
#define FOO goo
Then one of the members of the SE.DEFINES object will be FOO and its value will be the string "goo". You can examine and modify the defines, as well as adding new ones by creating new members. Note that these defines will only affect scripts that are executed after you make the change.
You may not write to the SE.DEFINES object itself.