Definition of lieu noun in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. lieu (ljuː; luː) n stead; place (esp in the phrases in lieu, in lieu of) [C13: from Old French, ultimately from Latin locus place] in lieu of sth If you do, get, or give one thing in lieu of another, you do, get, or give it instead of the other thing, because the two things are considered to have the same value or importance. For many speakers " lieu " and "loo" are now homophones. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. What is the pronunciation of lieu ?