half-duplex

[ haf-doo-pleks, -dyoo-, hahf- ]
/ ˈhæfˈdu plɛks, -ˈdyu-, ˈhɑf- /

adjective

of or relating to the transmission of information in opposite directions but not simultaneously.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020