(n.) A valuing or rating by the mind, without actually   measuring, weighing, or the like; rough or approximate calculation; as,   an estimate of the cost of a building, or of the quantity of water in a   pond. 
                        
                    
                    
                        
                        
                            (v. t.) To from an opinion of, as to amount,, number, etc.,   from imperfect data, comparison, or experience; to make an estimate of;   to calculate roughly; to rate; as, to estimate the cost of a trip, the   number of feet in a piece of land. 
                        
                    
                    
                        
                        
                            (v. t.) To judge and form an opinion of the value of, from   imperfect data, -- either the extrinsic (money), or intrinsic (moral),   value; to fix the worth of roughly or in a general way; as, to estimate   the value of goods or land; to estimate the worth or talents of a   person.