Definition of extensibility in US English:

extensibility

noun

  • 1The ability to be extended or stretched.

    ‘this process considerably diminishes the extensibility of the material’
    ‘salinity had relatively little effect on elastic extensibility’
    1. 1.1Computing The quality of being designed to allow the addition of new capabilities or functionality.
      ‘the software has been written from the ground up for extensibility and customization’

Pronunciation

extensibility

/ikˌstensəˈbilədē//ɪkˌstɛnsəˈbɪlədi/