Dictionary.com

reactive

[ ree-ak-tiv ]
/ riˈæk tɪv /
Save This Word!

adjective
tending to react.
pertaining to or characterized by reaction.
Electricity. pertaining to or characterized by reactance.
QUIZ
SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
Should you take this quiz on “shall” versus “should”? It should prove to be a quick challenge!
Question 1 of 6
Which form is used to state an obligation or duty someone has?

Origin of reactive

First recorded in 1705–15; react + -ive

OTHER WORDS FROM reactive

WORDS THAT MAY BE CONFUSED WITH reactive

proactive, reactionary, reactive
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

How to use reactive in a sentence

British Dictionary definitions for reactive

reactive
/ (rɪˈæktɪv) /

adjective
readily partaking in chemical reactionssodium is a reactive metal; free radicals are very reactive
of, concerned with, or having a reactance
responsive to stimulus
(of mental illnesses) precipitated by an external causereactive depression

Derived forms of reactive

reactively, adverbreactivity (ˌriːækˈtɪvɪtɪ) or reactiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for reactive

reactive
[ rē-ăktĭv ]

adj.
Tending to be responsive or to react to a stimulus.
Characterized by reaction.
Tending to participate readily in chemical reactions.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
FEEDBACK