Meaning of REACTIVE in English

rē+ adjective

Etymology: probably from (assumed) New Latin reactivus, from New Latin reactus (past participle of reagere to react) + Latin -ivus -ive — more at react


a. : of, relating to, or marked by reaction

reactive symptoms

a reactive process

b. : of, relating to, or marked by reactance


a. : readily responsive to stimulus

the skin of the geriatric is less reactive than that of younger persons — Louis Tuft

b. : occurring as a result of stress or emotional upset

reactive depression

• re·actively “+ adverb

• re·activeness “+ noun

Webster's New International English Dictionary.      Новый международный словарь английского языка Webster.