• Basis future, the value differential between a future and the spot price
• Basis (options), the value differential between a call option and a put option
• Cost basis, in the calculation of capital gains
• Basis (crystal structure), positions of the atoms inside the unit cell
• BASIS International, a software company
• in Renaissance music, the bassline was sometimes called the basis
• BASIS Charter School, a high-expectations school in Tucson, AZ

In mathematics:

• Basis (linear algebra)
• Schauder basis
• Basis (topology)
• Basis (Universal Algebra)
• Gröbner basis
• Greedoid
• Generating set of a group

In chemistry:

• Basis set (chemistry)

In people:

• Dimitris Basis Greek singer

See also

• Basis point, 0.01%, often used in the context of interest rates
• Basic
• Base