V/STOL definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
an aircraft that can take off and land either vertically or on a short airstrip
Origin: v(ertical or) s(hort) t(ake)o(ff and) l(anding)
V/STOL definition by American Heritage Dictionary
A convertiplane that can take off and land vertically or on a short runway.
Origin: v(ertical) s(hort) t(ake)o(ff and) l(anding).