'Expanse' definitions:

Definition of 'expanse'

From: WordNet
noun
A wide scope; "the sweep of the plains" [syn: sweep, expanse]
noun
The extent of a 2-dimensional surface enclosed within a boundary; "the area of a rectangle"; "it was about 500 square feet in area" [syn: area, expanse, surface area]
noun
A wide and open space or area as of surface or land or sky

Definition of 'Expanse'

From: GCIDE
  • Expanse \Ex*panse"\, n. [From L. expansus, p. p. of expandere. See Expand.] That which is expanded or spread out; a wide extent of space or body; especially, the arch of the sky. "The green expanse." --Savage. [1913 Webster]
  • Lights . . . high in the expanse of heaven. --Milton. [1913 Webster]
  • The smooth expanse of crystal lakes. --Pope. [1913 Webster]

Definition of 'Expanse'

From: GCIDE
  • Expanse \Ex*panse"\, v. t. To expand. [Obs.] [1913 Webster]
  • That lies expansed unto the eyes of all. --Sir. T. Browne. [1913 Webster]