initial / boost phase of flight

boost phase

single-phase and triple-phase convertor switcher

boost charge

boost octane

boost aeroballistic

boost-glide aeroballistic

octane number boost

power-boost control

ground controlled boost guidance

pay boost

initial flight

free-flight phase

flight restriction zone / flight restricted zone (FRZ)

initial airhead

initial assault

initial assault landing

initial data

initial element

initial geodetic data

initial nuclear radiation

initial operational capability (IOC)

initial path sweeping

initial period of war

initial point (IP)

initial radiation

initial railway

initial sight setting

initial situation

initial training

initial velocity

initial-entry force

initial-entry training (IET)