Wel·land (w?l??nd) A city of southeast Ontario, Canada, on the Welland Canal, about 44 km (27 mi) long, which connects Lake Erie with Lake Ontario and bypasses Niagara Falls.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.