direct dialing
US /ˌdɪ.rekt ˈdaɪ.əl.ɪŋ/
UK /ˌdɪ.rekt ˈdaɪ.əl.ɪŋ/
1.
a telephone system that allows a user to dial directly to an extension or another telephone without the assistance of an operator
:
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The hotel offers direct dialing to all rooms.
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With direct dialing, you can reach anyone without delay.