Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym GNIS is...

GNIS is

Global Names Information System
Geographic National Information Service
Global Ndt Internet Superhub
Geglobal Ndt Internet Superhub

More Meanings For GNIS:

Global Names Information System
Geographic National Information Service
Global Ndt Internet Superhub
Geglobal Ndt Internet Superhub
Geographic Names Information System

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