- interval extension
- interval function
- interval graph
- interval halving
- interval-halving search
- interval in an ordered set
- interval mathematics
- interval of continuity
- interval of convergence
- interval of definition
- interval of existence
- interval of integration
- interval of periodicity
- interval of relative stability
- interval of variation
- interval order
- interval relaxation method
- interval representation
- line of application
- line of a vector
- line of centers
- line of constant slope
- line of contact
- line of convergence
- line of curvature