vast:; very large or wide / vast:; very great in size, amount, degree, intensity, or especially extent / wide:; having a large physical extent from side to side / wide:; large in scope / broad:; wide in extent or scope / broad:; extended, in the sense of diffused; open; clear; full / broad:; having a large measure of any thing or quality; unlimited; unrestrained / broad:; comprehensive; liberal; enlarged / broad:; free; unrestrained; unconfined. / spacious, extensive, capacious / widespread, comprehensive, broad / public

(mathematics) area: a measure of the extent of a surface; it is measured in square units.