The state of being actual or real; realness.
The entirety of all that is real.
The real world.
An individual observer's own subjective perception of that which is real.
A real entity, event, or other fact.
Certainty.
A promise to pay a sum of money in the event that another person fails to fulfill an obligation.
One who undertakes to pay money or perform other acts in the event that his principal fails therein.
A substitute; a hostage.
Evidence; confirmation; warrant.
That which makes sure; that which confirms; ground of confidence or security.