Sentence:  He concluded that the anaconda 's maximum <WSD>length</WSD> is 12 or 13 ( perhaps 14 ) meters , which would approximate from 39 to 42 feet ( 14 meters is slightly less that 46 feet ) . 
Meaning of the word marked with <WSD> tags:  the linear extent in space from one end to the other; the longest dimension of something that is fixed in place