Jisho

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Expressions (phrases, clauses, etc.), Noun
1. dream within a dream; (beyond) one's wildest dreams; entirely unrealizable dream; pie in the sky
Wikipedia definition
2. Number 9 Dream"#9 Dream" is a song written by John Lennon and first issued on his 1974 album Walls and Bridges. It was released as the second single from that album months later, on Apple Records catalogue Apple 1878 in the United States and Apple R6003 in the United Kingdom. It peaked at #9 on the Billboard Hot 100 and #23 on the British singles chart.
Read “Number 9 Dream” on English Wikipedia
Read “夢の夢” on Japanese Wikipedia
Read “Number 9 Dream” on DBpedia

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