The cardinal number that is equal to the sum of 12 + 1.(noun)
The 13th in a set or sequence.(noun)
Something having 13 parts, units, or members.(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 "thirteen" in a sentence
"He defaulted three years later, hired a lawyer, failed to sell the house and hasn't made a mortgage payment in thirteen months."
"The fact that your mother could have been breast feeding you at age thirteen is …. too creepy to contemplate."
"I've anchored here a hundred times in thirteen fathoms."