Open [oh-puhn ] (adjective) not closed…having no means of closing or barring…relatively free of obstruction…without restrictions as to who may participate…undecided; unsettled… (from Dictionary.com) There is a great deal of confusion out there as to what ‘Open’ means, especially in science. The definitions above seem particularly apposite ‘…relatively free of obstruction…’. Certainly undecided or unsettled seems appropriate in some cases.