The act or state of being married; marriage.(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 "matrimony" in a sentence
"After all, fidelity in matrimony is voluntary, too …/sarcasm off"
"It had previously said that it was open to registering same-sex unions but wanted to reserve the term matrimony for heterosexual marriages."
"But some clergy had questioned whether church ceremonies - and the term matrimony - should be reserved for heterosexual unions."