Select Page




1. An automatic response to a simple stimulus which does not require mental processing. (; An involuntary response to a stimulus.(

2. (Science: neurology, physiology) A reflected action or movement, the sum total of any particular involuntary activity. An automatic instinctive unlearned reaction to a stimulus. (

3. An action or movement of the body that happens automatically as a reaction to something; something that you do without thinking as a reaction to something (

4.An action consisting of comparatively simple segments of behaviour that usually occur as direct and immediate responses to particular stimuli uniquely correlated with them. (

5. a. Something, such as light or heat, that is reflected; b. An image produced by reflection; a copy or reproduction.(

6. (Psychology) An unlearned or instinctive response to a stimulus.


1. (Of an action) Performed without conscious thought as an automatic response to a stimulus. (Google Dictionary)

2. (Physiology) Being an involuntary action or response, such as a sneeze, blink, or hiccup. (

Word origin: from Late Latin reflexus “a bending back.”

Struggling in Biology?

Are You Premed?

Confused about the MCAT? Not sure how to prepare? This guide will show you how