mobility

Concise Oxford English Dictionary © 2008 Oxford University Press:
mobile /ˈməʊbʌɪl/

▶adjective able to move or be moved freely or easily.

■ (of a shop, library, etc.) accommodated in a vehicle so as to travel around.

■ able or willing to move between occupations, places of residence, or social classes.

▶noun

• 1 a decorative structure suspended so as to turn freely in the air.

• 2 a mobile phone.

– phrases
upwardly (or downwardly) mobile moving to a higher (or lower) social class.

– derivatives
mobility noun.

– origin C15 (earlier (ME) as mobility): via Fr. from L. mobilis, from movere ‘to move’.