Wordnet 3.0
NOUN (1)
1.
an imaginary place where you say people are when they seem optimistically out of touch with reality;
The Collaborative International Dictionary of English v.0.48:
cloud-cuckoo-land \cloud-cuckoo-land\ n.
an imaginary place where fantasy and illusion predominate; it
is a place where you say people are when they seem
optimistically out of touch with reality.
[WordNet 1.5 +PJC]
WordNet (r) 3.0 (2006):
cloud-cuckoo-land
n 1: an imaginary place where you say people are when they seem
optimistically out of touch with reality