Add scheleton definitions chapter.

src/std.adoc

@@ -47,6 +47,7 @@ include::std.license.adoc[leveloffset=+1]
 include::std.intro.adoc[leveloffset=+1]
 include::std.conventions.adoc[leveloffset=+1]
 include::std.refs.adoc[leveloffset=+1]
+include::std.defs.adoc[leveloffset=+1]
 
 //-------------------------------------------------------------------
 // Appendices..

src/std.defs.adoc

@@ -0,0 +1,18 @@
+[[intro.defs,([intro.defs])]]
+= Terms and definitions [.right]#<<intro.defs,[intro.defs]>>#
+
+(((definitions)))
+For the purposes of this document,
+the terms and definitions given in <<BCP166>>,
+and the following apply.
+
+Terms that are used only in a small portion of this document are defined where
+they are used and _italicized_ where they are defined.
+
+////
+(((application)))
+
+[[defns.application,([defns.application])]]
+application::
+a computer program that performs some desired function.
+////