1. Clear and easy to understand: This is the most common meaning. It describes something that is readily comprehensible, free from confusion or ambiguity.
* Example: "The professor gave a lucid explanation of the complex theory."
2. Conscious and alert: This meaning applies to a person's mental state. It describes someone who is fully aware of their surroundings and thoughts, and is able to think clearly.
* Example: "After the surgery, the patient was lucid and able to answer questions."
3. Vivid and detailed: This meaning is often used to describe dreams. A lucid dream is a dream where the dreamer is aware that they are dreaming and can often control the dream's events.
* Example: "She had a lucid dream where she could fly over the city."
4. Shining or bright: This meaning is less common, but it can be used to describe something that is visibly clear or bright.
* Example: "The moon shone with a lucid light."
In short, "lucid" describes something that is clear, understandable, and free from confusion or ambiguity. It can apply to ideas, explanations, mental states, and even physical appearances.