Economic Definition of T-bill. Defined.
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Term T-bill Definition: The abbreviation for Treasury bill, which is one kind of government security issued by the U. S. Treasury to obtain the funds used to finance the federal budget deficit. A Treasury bill (or T-bill) has a maturity length of one year or less, with 90 days a common maturities. T-bills, together with short-term commercial paper issued by businesses, are traded in money markets. The interest rate on T-bills is one of the key indicators of short-run economic activity.