up·front / ˌəpˈfrənt/ inf. • adv. (usu. up front) 1. at the front; in front: I was sitting up front. 2. (of a payment) in advance: the salesmen are paid commission up front.• adj. 1. bold, honest, and frank: he'd been upfront about his intentions. 2. (of a payment) made in advance. 3. at the front or the most prominent position: a literary weekly with an upfront section modeled on the New Yorker.