Final answer:
The term describing a portion of the spectrum used for Wi-Fi communication is 'channel'. Wi-Fi operates at 2.4 to 5 GHz and channels are segments of these frequencies for data transmission.
Step-by-step explanation:
The term that describes a portion of the available spectrum for Wi-Fi network communication is channel. Wi-Fi networks operate on the electromagnetic spectrum and use specific frequency ranges within it, typically at 2.4 to 5 GHz. Each Wi-Fi channel represents a discrete segment of frequencies through which data is transmitted and received. Tthese channels are designed not to be absorbed much by common building materials, making Wi-Fi efficient for indoor use. Channels must be managed properly to avoid interference between different networks.