Regarding a futures contract , the difference between the cash price and the futures price observed in the market . Also, it is the price an investor pays for a security plus any out-of-pocket expenses. It is used to determine capital gains or losses for tax purposes when the stock is sold.
Meaning of BASIS in English
Campbell R. Harvey. Hypertextual finance English glossary. Английский словарь гипертекстовых финансов. 2012