[racket] A primitive more fundamental than a continuation?

> The phrase 'evaluation context' has been in the literature since 1986 for just
this purpose. I know, I coined it. 
> 

I wonder if there's been terminology drift in the reference

For example:

In the documentation, 'expression context' appears and is defined (Ref. 1.2.3.3)

'continuation frame' appears, but is not defined (Ref. 1.1.11)

and 'evaluation context' does not appear.