(n): belief about (or mental picture of) the future
(n): capability of existing or happening or being true
(n): the state or fact of existing
(n): a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
(n): an abstract or general idea inferred or derived from specific instances
(n): a possible alternative
(n): one of a number of things from which only one can be chosen