From WordNet (r) 3.0 (2006) [wn]:
working memory
n 1: memory for intermediate results that must be held during
thinking
From The Free On-line Dictionary of Computing (8 July 2008) [foldoc]:
working memory
<storage, architecture> The parts of main memory (RAM)
currently in use.
In a production system, working memory contains the facts,
both initial and generated.
(2005-06-17)