the GNU version of the Collaborative International Dictionary of English
adj. Of or pertaining to an area.
The Century Dictionary and Cyclopedia
Pertaining to or of the nature of an area: as, areal interstices.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. of or relating to or involving an area
Word Usage
"That works out to a storage density, called areal density in the industry, of 329GB per square inch - the highest yet for any hard-disk drive, according to Seagate."