Definition of mobile adjective from the Oxford Advanced Learner's Dictionary

Oxford3000

mobile

adjective
ˈməʊbaɪl
 
; ˈmoʊbl
 
 
1 [usually before noun] that is not fixed in one place and can be moved easily and quicklymobile equipmenta mobile shop/library(= one inside a vehicle) compare stationary2 [not usually before noun] (of a person) able to move or travel around easilya kitchen especially designed for the elderly or people who are less mobileYou really need to be mobile (= have a car) if you live in the country.
Opposite
immobile
3 (of people) able to change your social class, your job or the place where you live easilya highly mobile workforce (= people who can move easily from place to place) see also upwardly mobile4 (of a face or its features) changing shape or expression easily and oftenHis mobile features registered amusement.