clearly express and easy to understand, or (of person) thinking, speaking or writing clearly
have full use of one’s faculties; sane
Literary: bright or luminous
psychology(of a dream) experienced with the dreamer feeling awake, aware of dreaming, and able to control event consciously
She gave a clear and lucid account of her plans for the company’s future.
One minute he can be very lucid and at other times he’s confused about where is.
I know I probably wasn’t really awake; maybe it was a lucid dream?
It is a lucid bright day, and a lush tree looms across the window.