pos·si·bly / ˈpäsəblē/ • adv. 1. perhaps (used to indicate doubt or hesitancy): he found himself alone, possibly the only surviving officer. ∎ used in polite requests: could you possibly pour me another cup of coffee?2. in accordance with what is likely or achievable, in particular: ∎ used to emphasize that something is difficult, surprising, or bewildering: what can you possibly mean? ∎ used to emphasize that someone has or will put all their effort into something: be as noisy as you possibly can.