the system of using an express service, or the charges made for that service
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expressage UK US /ɪkˈspresɪdʒ/ noun [U] US
► TRANSPORT the fast transport of goods, letters, packages, etc. from one place to another using an express service, or the charge for such a service: »
He asked for it to be sent at once by expressage.
Financial and business terms. 2012.