Merriam-Webster's Collegiate® Dictionary, 11th Edition
DILUTE
I. transitive verb (diluted; diluting) see: lye
Date: circa 1555
attenuate , to make thinner or more liquid by admixture , to diminish the strength, flavor, or brilliance of by admixture , to decrease the per share value of (common stock) by increasing the total number of shares, diluter or dilutor noun dilutive adjective
II. adjective
Date: 1605
weak , diluted, diluteness noun