Definition of tri-band adjective from the Oxford Advanced Learner's Dictionary

 

tri-band

 adjective
adjective
BrE
 
; NAmE
 
 
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(of a mobile/cell phone) able to use three different ranges of radio waves so that it can be used in different regions of the world This tri-band world phone will work on three networks in five continents.
See the Oxford Advanced American Dictionary entry: tri-band