Initial Approach Segment

That segment of an instrument approach procedure between the initial approach fix and the intermediate approach fix or, where applicable, the final approach fix or point. (FAA4)

[ICAO]
That segment of an instrument approach procedure between the initial approach fix and the intermediate approach fix or, where applicable, the final approach fix or point. INLAND NAVIGATION FACILITY
A navigation aid on a North American Route at which the common route and/or the noncommon route begins or ends. 

(See SEGMENTS OF AN INSTRUMENT APPROACH PROCEDURE.)