"How I Met Your Mother" Definitions (TV Episode 2009) - IMDb
: After spending the entire summer in a casual sexual relationship, Barney and Robin are forced by Lily to "define" their relationship. Lily eventually locks them in a room until they admit they are boyfriend and girlfriend. [S5E1] Definitions
: Ted begins his first day as an architecture professor at Columbia University. He struggles to decide on his "persona"—alternating between a stern authoritarian and a "cool" laid-back teacher—before realizing he is accidentally teaching an economics class instead of architecture. "How I Met Your Mother" Definitions (TV Episode
: Future Ted reveals that the titular "Mother" was actually in the classroom during his humiliating economics lecture. Production Credits Director : Pamela Fryman. Writers : Carter Bays and Craig Thomas. Original Air Date : September 21, 2009. Trivia & Fun Facts Writers : Carter Bays and Craig Thomas
In the season five premiere of How I Met Your Mother , titled "," the series explores the anxiety of starting new chapters and the fear of commitment. Episode Overview