Definition of hypermobility in English:

hypermobility

Pronunciation /ˌhīpərˌmōˈbilədē/ /ˌhaɪpərˌmoʊˈbɪlədi/

noun

Medicine
  • A condition of having an unusually or abnormally great range of movement in a joint or joints.

    ‘joint hypermobility can vary greatly between different people’
    • ‘her son has autism and hypermobility’

Origin

1920s from hyper- + mobility.