home Harold Diaz open o⋅pen [oh-puhn] –adjective 1. not closed or barred at the time, as a doorway by a door, a window by a sash, or a gateway by a gate: to leave the windows open at night. 2. (of a door, gate, window sash, or the like) set so as to permit passage through the opening it can be used to close. 3. having no means of closing or barring: an open portico. 4. having the interior immediately accessible, as a box with the lid raised or a drawer that is pulled out. 5. relatively free of obstructions to sight, movement, or internal arrangement: an open floor plan. o a b c d e f g h i j k l m n o p q r s t u v w x y z observatory office observe old oneiric open outlook overcast orange