Dictionary.com
Thesaurus.com
Synonyms

responsiveness

American  
[ri-spon-siv-nis] / rɪˈspɒn sɪv nɪs /
Also responsivity

noun

  1. the quality or state of being responsive.

  2. Machinery. the ability of a machine or system to adjust quickly to suddenly altered external conditions, as of speed, load, or temperature, and to resume stable operation without undue delay.


Etymology

Origin of responsiveness

First recorded in 1840–50; responsive + -ness