Trust
In the TV series Battlestar Galactica (2004), there is a brief scene (season 3, episode 4, at 31:31) which beautifully illustrates the meaning of the word trust. To understand the brief exchange, you need a little background info. Admiral Adamah, commander of the fleet with the remnant of humanity, has tasked Sharon with leading the assault to rescue the civilian population from the enemy androids. Thing is, she's one of those androids. Just before departure she asks the admiral: "How do you know? I mean, how do you really know, that you can trust me?" Adamah answers: "I don't. That's what trust is."