Sentence:  Much new equipment and <WSD>many</WSD> unique techniques have been developed for the quantitative exposure of experimental animals to aerosols of infectious agents contained in particles of specified dimensional characteristics . 
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