In English, the word "dream" is usually used as a noun or a verb. As a noun, it can refer to a series of images, ideas, emotions, and sensations that occur in a person's mind during sleep. It can also refer to a cherished aspiration or ambition, or a fantastic or unrealistic idea. As a verb, it means to have a series of images, ideas, emotions, and sensations that occur in a person's mind during sleep, or to have a cherished aspiration or ambition.