I searched for the meaning of “as” in English-Spanish Oxford dictionary, which says it is used to define a word. Is this true? (defining): ① it would be the end of civilization as we know it significaría el fin de la civilización tal y como la conocemos ② I'm only interested in the changes as they affect me solo me interesan los cambios en la medida en que me afectan a mí ③ Sri Lanka, or Ceylon, as it used to be known Sri Lanka, o Ceilán, como se llamaba antes ④ Paris as seen by tourists is a very different city el París que ven los turistas es una ciudad muy distinta ⑤ their position, as opposed to ours su postura, en contraste con la nuestra