Sentence:  Aside from the fact that business was slow this time of year and his <WSD>one</WSD> salesgirl was not the most enterprising , Mr. Phillips had no worries at all , and he said as much to Gun Matson , who sat across from him in civilian clothes , on a Jiffy-Couch-a-Bed , mauve velour , $ 79.89 nothing down special ! 
Meaning of the word marked with <WSD> tags:  having the indivisible character of a unit