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estimation  (estimations plural )
1  n-sing Your estimation of a person or situation is the opinion or impression that you have formed about them. 
FORMAL usu with poss 
He has gone down considerably in my estimation.  
2  n-count An estimation is an approximate calculation of a quantity or value. 
oft N of n  (=estimate) 
...estimations of pre-tax profits of £12.25 million.