1) Multiphase 2) Point 3) Point in time 1) Multiphase 
• (a.) Having or producing two or more phases; multiphase; as, a polyphase machine, a machine producing two or more pressure waves of electro-motive force, differing in phase; a polyphase current.
Pol'y·phase adjective [ Poly- + phase .] (Electricity) Having or producing two or more phases; multiphase; as, a polyphase machine, a machine producing two or more pressure waves of electro-motive force, differing in phase; a polyphase current. 
polyphase 1. Having more than one phase or multiple phases. 2. Of or pertaining to a set of alternating currents that have the same frequency but different phases and that enter a specified region at more than two points.
A polyphase system is a means of distributing alternating current electrical power. Polyphase systems have two or more energized electrical conductors carrying alternating currents with a definite time offset between the peak amplitudes of the wave in eac