Sentence:  What data there are on growth indicate considerable variation in rate ; unfortunately , no one has kept complete records of one individual , whereas <WSD>many</WSD> have been made for a very short period of time . 
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