Oxymoron is a figure of speech in which contradictory or incongruous words are combined. In the given sentence, an example of oxymoron is <em>alone together. </em>When someone is alone, they are on their own, with no one else present. However, the word <em>together</em> implies that two or more people are present. This is why it's unusual to see these words combined. Their meanings are contradictory, which makes this an oxymoron.
The word would be extrinsic. Extrinsic means "<span>not part of the essential nature of someone or something; coming or operating from outside."</span>
