1. a person who has dreams while sleeping
2. a person who has unrealistic or impractical ideas or goals
3. a person who imagines or hopes for something better

Examples

• She was a vivid dreamer who remembered her dreams in great detail.
• My brother is such a dreamer – he thinks he’ll become a rock star overnight.
• The young dreamer spent hours imagining a world without poverty.
• Don’t be such a dreamer; you need to focus on realistic goals.
• Martin Luther King Jr. was a dreamer who envisioned equality for all.
• As a child, she was a constant dreamer, always lost in her imagination.