matter of necessity ( synonym found)
Definition of matter of necessity:

°a solid-state semiconductor device, with three terminals, which can be used for amplification, switching, voltage stabilization, signal modulation, and many other functions.
°(dated informal) a transistor radio.
Definition of matter of necessity:

°a solid-state semiconductor device, with three terminals, which can be used for amplification, switching, voltage stabilization, signal modulation, and many other functions.
°(dated informal) a transistor radio.
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