Wiktionary
n. A dream in which one is conscious that one is dreaming as the dream is occurring.
Wikipedia
A lucid dream is any dream during which the dreamer is aware that they are dreaming. During lucid dreaming, the dreamer may be able to exert some degree of control over the dream characters, narrative, and environment.
The term 'lucid dream' was coined by Dutch author and psychiatrist Frederik van Eeden in his 1913 article A Study of Dreams, though descriptions of dreamers being aware that they are dreaming predates the term.
Usage examples of "lucid dream".
As a means of testing and documenting lucid dream states, the subjects are told to make three full-excursion movements to the left followed by three full-excursion movements to the right.
If this was a lucid dream, Derec thought, then he should be able to flee from the old bastard.
She roused to a strange, soft awareness that reminded her of a lucid dream.
One morning he awoke from a particularly lucid dream that he firmly believes was sent to him by the spirit of Anaya.
We can send you so far down you think no more than a second's passed during those two hundred days, or you can lucid dream every second of them.
I was able to lucid dream for a year, then for some reason it stopped.
I'm aware, so it's a lucid dream, so I can affect it, and he'll be the man because I want him to be.