- involute line
- involution
- involution distribution
- involutory algebra
- involutory correlation
- involutory homology
- involutory matrices
- involutory transformation
- involve
- ion spot
- ionization time
- IP
- IP Address
- iron filing
- iron-bar
- irrational number
- irreducible character
- irreducible continuum
- irreducible element
- irreducible equation
- irreducible polynomial
- irreducible representation
- irredundant
- irrefutable formula
- irregular settlement
- irrelevance
- irreversibility
- irrotational deformation
- irrotational field
- irrotational vector
- ISA bus
- ISEG directive
- inward
- IO control
- IPL
- IPv6
- IPX-SPX
- iron
- iron soft
- iron-mould
- irradiate
- irrational invariant
- irreducibility
- irreducible
- irreducible correspondence
- irreducible curve
- irreducible group
- irreducible variety
- irreducibly connected
- irrefutable
- irregular polygon
- irregular polyhedron
- irrelevant
- irreversible
- irrotational motion
- isentropic flow
- isentropic process
- ISO 8211
- ISO 9000
- ISO 9660
- ISO sizes
- isobits bit
- isochronous
- isochronous circuit
- isochronous communication
- isochronous communications
- isochronous transmission
- isocline method
- isocline plane
- isoenergetic
- isogenous
- isogonal
- isogonal line
- isogonal magnification
- isogonal trajectory
- isogonic
- isolate
- isolated
- isolated amplifier
- isolated completion
- isolated component
- isolated element
- isolated foundation
- isolated location
- isolated point
- isolated set
- isolated space
- isolated value
- isolation amp1ifier
- isolation diode
- isolation network
- isolator
- isologic curve
- isometric
- isometric correspondence
- isometric drawing
- isometric parameter
- isometric projection
- isometric space
- isometric surface