Pronunciation (UK) IPA (key): /ˌrɛzəˈveɪʃən/ (US) IPA (key): /ˌrɛzɚˈveɪʃən/ Noun Singular reservation Plural reservations The act of reserving or withholding something. Something that is withheld or reserved. (usually plural) A hesitation. I have reservations about telling him what I did. I'm afraid he'll break up with me if he knows. Land given to Native American people by the United States government. If you make a reservation, you reserve or pay for a room or seat in advance to be sure that the room or seat will be available for you when you get there. They made a reservation at the restaurant. (UK) The area which separates opposite lanes of traffic on a divided road; a median or divider on a road. Related words reserveWikiwand - on Seamless Wikipedia browsing. On steroids.