Sentence:  The elasticity as a parameter of fluids which is not subject to simple measurement at present , and it is a parameter which is probably varying in an unknown manner with <WSD>many</WSD> commercial materials . 
Meaning of the word marked with <WSD> tags:  a quantifier that can be used with count nouns and is often preceded by `as' or `too' or `so' or `that'; amounting to a large but indefinite number