Routing-number Definition
noun
(US) An eight or nine digit number used by a banking institution to designate a certain geographic area used to direct and sort inquiries and transactions to the correct district, usually shown at the bottom left of a check.
Mom, what is a routing number? Why do I have to use some bank number instead of plastic? That would be so much easier!
My cashiers always get confused finding the right check, account, and routing numbers because customers seldom pay with checks.
Wiktionary
Other Word Forms of Routing-number
Noun
Singular:
routing-number
Plural:
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