capability of existing or happening or being true
"there is a possibility that his sense of smell has been impaired"
a tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena
"a scientific hypothesis that survives experimental testing becomes a scientific theory"
"he proposed a fresh theory of alkalis that later was accepted in chemical practices"
The quality of being possible.
"The sheer possibility that we could finish the project by Friday kept the whole team motivated despite the tight deadline."
In plain English: A possibility is something that might happen but isn't certain yet.
"We discussed every possibility before making our final decision."
Usage: Use "possibility" to refer to something that may happen or exist, such as the chance of rain tomorrow. It describes an event or state that is not impossible, rather than the abstract quality of being capable of occurring.
Possibility entered English in the late 14th century via Middle French and earlier forms of Old French, ultimately tracing back to the Late Latin word possibilitas. The term originally carried the same meaning it does today, describing a state that is able to happen or be true.