- incomparable
- incompressible flow
- incondensable
- incorrodible
- increasing temperature
- incremental induction
- incremental permeability
- index gradient
- indicated work
- indicating instrument
- indicating relay
- indicator diagram
- indigo
- indirect action
- indirect cooling
- individual error
- indoor rack
- indoor thermostat
- induced EMF
- induced transformation
- inductance coil
- induction machine
- induction problem
- inductive coupling
- inductive fall
- inductive load
- inductor machine
- industrial instrument
- industrial refrigeration
- inelastic collision
- inelastic scattering
- inaccessible
- inadequacy
- inadherent
- inaudible
- inaudible sound
- incandescent gas
- inch
- incident power
- inclination
- incombustibility
- incoming flux
- incoming selector
- incompressible fluid
- inconstant
- incremental hysteresis
- incremental recorder
- indecomposable
- index ellipsoid
- index ratio
- indicated value
- indirect method
- individual reception
- indoor condenser
- indoor flow
- inductance measurement
- inductance standards
- induction accelerator
- induction coupling
- induction instrument
- induction meter
- inductive divider
- inductive surge
- industrial humidifier
- inefficient
- inertia switch
- inertia welding
- inertial frame
- inextensible
- inextractable
- influx
- infrared absorption
- incremental inductance
- incremental resistance
- independent current
- independent mesh
- indestructive
- indicator
- indiffusible
- indirect access
- indirect illumination
- indirect stroke
- indoor battery
- induced capacity
- induced emission
- inducing
- inductance factor
- induction hardening
- inductive circuit
- inductive post
- industrial cooler
- inert atmosphere
- inertial separator
- infill panels
- infiltration load
- infinite range
- inflow
- influence electricity
- influence machine
- infrasonic microphone