What does EXTN stand for?

Extension

This definition appears very rarely

Other Resources:

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Extra Time Allowance Ecstacy Extended Consciousness Extend Extension (Canada Post road designation) Extended Exercise Extension of Enlistment Extrudable Explosive Extension of Leave of the Following Named Individual Has Been .... Extra Time		Extended Data Transfer Extender Extension Extension Exit Only Inc. (stock symbol) Exercise Torpedo Department of External Affairs (Canada) Extension Toxicology Network EXecutionTRace Analyser Executive Training for Research Application (Canadian Health Services Research Foundation)