match·​ing | \ ˈma-chiŋ How to pronounce matching (audio) \

Definition of matching

1 of two or more things

a : going together well : suitably paired or used together matching colors … a formfitting navy Armani suit and matching pumps …— Leslie Bennetts
b : having the same appearance, design, etc. In their matching yellow jumpsuits and white T-shirts they looked like gateposts marking the entrance to the house.— Ann M. Martin Meanwhile, over the past few months, Kylie Jenner and Pia Mia have been sighted in matching outfits on more than one occasion while shopping and lunching in LA.— Erika Stalder
2 : forming part of a pair or set searched the clean laundry for a matching sock
3 : equal in amount made matching contributions especially : equal in amount to money obtained from another source … a proposal that he has sponsored in the legislature would provide $25-50 million in matching funds for biotechnology research and development to companies choosing Louisiana as their base. — Stephen Budiansky

First Known Use of matching

1630, in the meaning defined at sense 2

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The first known use of matching was in 1630

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to form ideas or theories about something

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