'Lieu' definitions:

Definition of 'lieu'

From: WordNet
noun
The post or function properly or customarily occupied or served by another; "can you go in my stead?"; "took his place"; "in lieu of" [syn: stead, position, place, lieu]

Definition of 'Lieu'

From: GCIDE
  • Lieu \Lieu\ (l[=u]), n. [F., OF. also liu, leu, lou, fr. L. locus place. See Local, Locus.] Place; room; stead; -- used only in the phrase in lieu of, that is, instead of. [1913 Webster]
  • The plan of extortion had been adopted in lieu of the scheme of confiscation. --Burke. [1913 Webster]