The Collaborative International Dictionary of English v.0.48:
Acreage \A"cre*age\, n. Acres collectively; as, the acreage of a farm or a country. [1913 Webster]WordNet (r) 3.0 (2006):
acreage n 1: an area of ground used for some particular purpose (such as building or farming); "he wanted some acreage to build on" [syn: acreage, land area]