noun
a process or treatment that occurs after the main treatment or process has been completed
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The aftertreatment system is designed to reduce harmful emissions from the vehicle.
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Make sure you take your car in for aftertreatment maintenance to keep it running smoothly.
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I heard the aftertreatment on that truck is top-notch, it's practically brand new.
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Implementing aftertreatment measures can help clean up the environmental mess we've made.