- The definition of a first cousin is the son or daughter of one of your parent's siblings.
An example of a first cousin is your aunt's child.
first cousin 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.
the son or daughter of one's uncle or aunt
first cousin definition by American Heritage Dictionary
nounThe American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
first cousin - Phrases/Idioms
A close relation or resemblance to someone or something, as in This new machine is a first cousin to the previous model. The figurative use of cousin, which literally means “the child of one's aunt or uncle,” dates from the 1300s.