Something that serves to fortify, especially military works erected to fortify a position or place.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "fortification" in a sentence
"OSHRI: This is what I identify as fortification wall."
"Well know the Sea Dragon of seaport fortification is V. Family against and blance to D. Land important stratagem main."
"Okay, lastly, the fortification is more than just the wall."