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

GISS is

Goddard Institute For Space Science
General Impression Size And Shape
Generic Internet Service Specification

More Meanings For GISS:

General Impression of Size and Shape
Goddard Institute for Space Studies
Goddard Institute For Space Science
General Impression Size And Shape
Generic Internet Service Specification

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