"Definitions" - When the gang finds out that Barney and Robin are hesitant to define their relationship, Lily forces them to confront their biggest fear...becoming boyfriend/girlfriend. Meanwhile, Ted is anxious about teaching his first lecture at Columbia, on the fifth season premiere Monday, Sept. 21
How I Met Your Mother Episode Preview - How I Met Your Mother –5.01: Definitions Synopsis, Promo and Sneak Peeks, airdate: Monday, September 21, 2009 - How I Met Your Mother Episode Guide
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How I Met Your Mother –5.01: Definitions Promos & Sneak Peeks
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