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

TTIS is

Transkentucky Transportation Railroad Incorporated

More Meanings For TTIS:

Teens Teaching Internet Skills
Technology Training And Instructional Support
Traffic And Travel Information Systems
Ts The Telegraph In Schools
Titan Technologies Information Systems
Total Time In Service
Training For The Individual Soldier
Transkentucky Transportation Railroad Incorporated

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