estimation
    /ˌɛstəˈmeɪʃən/ 
    
 
    
    noun
    
    plural -tions
    
    [singular] formal :a judgment or opinion about something
    
    
    
    
    
    
    
    [noncount] :the act of judging the size, amount, cost, etc., of something :the act of estimating something
    
    
    
    
    
    [count] :a guess about the size, amount, cost, etc., of something