A hallucination is something that someone experiences which is not really there.

Probably the best way to describe a hallucination is that it is like dreaming while you are awake. Not daydreaming, which comes from conscious thoughts, but the things contained in your sub-conscious which are projected from your mind and appear to blend in with the real world. Hallucinations can be quite deceiving (especially if it is a mix of a visual images, sound and even the sensation of touch) and, like dreams, sometimes you know it’s not real but other times you are unsure. Also like dreams, hallucinating can warp or distort your thinking, causing you to know things you shouldn’t and to completely forget things that are common sense, obvious and every day practice.

There are five different types of hallucination:
* visual (seeing things)
* auditory (hearing things)
* olfactory (smelling things)
* gustatory (tasting things)
* tactile (feeling things)
Often, two or more of these will be mixed together at the same time.

Hallucinating can happen to anyone at all, and at any age. Some people hallucinate on a daily basis, while others may only experience it once and even then very briefly in their entire life.
Taking certain drugs may result in hallucinating, while for others, they may hallucinate because they have a mental illness or even for no obvious reason at all (even though there probably is a reason). For those who don't use drugs to hallucinate, different things can trigger it such as being alone, being around too many people, too much noise, no noise, the dark, etc.

to hallucinate is to see things that are not really there, or to distort objects that are there, shrooms, and acid will make you hallucinate.

When you see something that is not there.

Hallucineating: when you're eating one thing and imagine it's better than it really is. you're hallucinating while eating.

When a person wants to avoid answering a question from the past and shakes it off as the person hallucinating that memory.

are visual, ghost-like thingies you get mostly by taking ‘shrooms.

When you smell something that really isn't there.

The only explanation for the Right’s perverse devotion to the Mobster in Chief.

A memory of something that never existed in the first place, also known as a "false memory", but fancier.