Financial Dictionary abcdefghijklmnopqrstuvwxyz Search for terms: OASDI Official name of Social Security program in the United States, and is a short for Old Age, Survivors and Disability Insurance Program. Tweet Related Terms Occupy Wall Street Opening Transaction Overadvance Option Series OTC (Over-the-Counter) Operating Cash Flow Overallotment Option Writer OTCBB (Over-the-Counter-Bulletin-Board) Operating Lease