: indicating a quantity whose algebraically positive and negative values serve to bracket a range of values either alone or when added to and subtracted from a given number                                      
              
                             
measured with an accuracy of plus or minus 3 feet
                         
                
                    
                                
              
          
                                                      : more or less, approximately                                      
              
                             
a dance for singles plus or minus age 30
                         
                
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  Merriam-Webster unabridged




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