...entities
Free-standing entity is not an actual frame in the ontology; we use the term when describing the top-level organization of the ontology in order to distinguish between objects and events on the one hand and properties on the other.

...EVENTs.
There is no separate concept for states in the K ontology. A state is merely a reified property of a concept.

...concept
or the special symbol *nothing* used to block inheritance

...NON-VERBAL-COMMUNICATIVE-ACTs.
We use the term EVENT almost always. The term act is used only for certain subclasses of COMMUNICATIVE-EVENTs to rhyme with the well-known concept of SPEECH-ACTs. However, the terms activity and EVENT are often used interchangeably for EVENTs under SOCIAL-EVENTs.

...professions.
It is not always easy to determine whether an EVENT is a WORK-ACTIVITY or a NON-WORK-ACTIVITY. For example, PLAY-SPORT has been placed under NON-WORK-ACTIVITY but could very well be under WORK-ACTIVITY, especially if we consider the present day lucrative professions in sports.

Kavi Mahesh
Wed Nov 8 14:51:16 MST 1995