，内积- integro-functional equation
- integro-interpolation method
- integro-ordinary differential equation
- integro-partial differential equation
- integro-power series
- intelligence
- intelligence test
- intelligent
- intelligent algorithm
- intelligent control
- intelligibility
- intelligible
- intense
- intensified continuity
- intension
- intensional
- intensional logic
- intensional model
- intensional property
- intensity
- intensity function
- intensity matrix
- intensive quantity
- intensive variable
- interacting particle system