Reality (noun)

1. The state of things as they actually exist, as opposed to an idealistic or notional idea of them.
2. The state or quality of having existence or substance.
3. The world or the state of things as they actually exist, as opposed to an idealistic or notional idea of them.

Origin:

Late middle english: from old french realite or latin realitas, from res "thing". the term originally denoted the state of being real, and has not changed its meaning.

Examples:

1. The reality of the situation is not as bad as it seems.
2. He couldn't accept the harsh reality of her death.
3. The gap between perception and reality.
4. The TV show is a reality show.
5. He is not living in reality if he thinks he can win the lottery.