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What does "+ve" and "-ve" displacement mean in cohesive contact stress table?

I am trying to model cohesive contact between two different materials in Marc-Mentat and in Marc Volume A under "Cohesive Contact" title there is a paragraph which explains displacement table. In this paragraph an abbreviation is mentioned which is "+ve" and "-ve" displacement. What does "ve" mean? Does it mean value? I have added the piece of paragraph below.
 
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