T - Definitions
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T
tier 1 vendor
A tier 1 vendor is one of the largest and most well known in its field -- often enjoying national or international recognition and acceptance...(Continued)
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TIN (Taxpayer Identification Number)
A Taxpayer Identification Number (TIN), in the United States, is a unique nine-digit number for identifying an individual, business or other entity in tax returns and additional documents filed with the Internal Revenue Service (IRS).