Sentence:  Sirius is 8.6 light years away /  Arcturus is 37 / The past is the past and it's here to stay / <WSD>Wikipedia</WSD> is Heaven / When you don't want to remember no more / On the far side of the morning 
Meaning of the word marked with <WSD> tags:  A free-content online encyclopedia founded in 2001, collaboratively developed over the World Wide Web in a number of languages.