means Something that may happen or be true but isn't certain yet — a state of being possible.

from From Latin possibilis, 'able to be done,' built on posse, 'to be able' — itself a squeeze of potis ('able, powerful') and esse ('to be'). The same posse fuels 'potent,' 'power,' and 'possess.' It reached English through Old French possibilité, carrying that ancient sense of latent capacity: not what is, but what is within reach of being.