Sentence:  He concluded that the anaconda 's maximum length is 12 or 13 ( perhaps 14 ) meters , which would approximate from 39 to 42 feet ( 14 <WSD>meters</WSD> is slightly less that 46 feet ) . 
Meaning of the word marked with <WSD> tags:  the basic unit of length adopted under the Systeme International d'Unites (approximately 1.094 yards)