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Definition of T-Day
1. Noun. (US military) Training Expansion Day; the effective day coincident with Presidential declaration of national emergency and authorization of partial mobilization (not more than 1,000,000 personnel exclusive of the 200,000 callup). ¹
2. Noun. (US slang) Thanksgiving Day (or, humorously, Turkey Day) ¹
¹ Source: wiktionary.com