an action that is performed as a response to a stimulus and without conscious thought, a physical reaction to something that you cannot control

knee-jerk reflex, reflex action, reflex arc

Formal and Informal Expressions of reflex

In different contexts, you can replace 'reflex' with suitable alternatives. In a more formal setting, 'response, reaction' is apt. In informal speech or writing, 'knee-jerk' is a commonplace synonym.

reflex: Explore its Definition & Usage

reflex Definition

1an action that is performed as a response to a stimulus and without conscious thought
2a physical reaction to something that you cannot control

Using reflex: Examples

Take a moment to familiarize yourself with how "reflex" can be used in various situations through the following examples!

Example
The doctor tested my reflexes by tapping my knee with a hammer.
Example
It was a reflex for her to duck when the ball came flying towards her.
Example
He had a reflex to apologize whenever he made a mistake.

reflex Synonyms and Antonyms

Synonyms for reflex

Phrases with reflex

knee-jerk reflex
an automatic and unthinking response to something, often used to describe a negative or defensive reaction
Example
His knee-jerk reflex was to deny any wrongdoing.
reflex action
an immediate and automatic response to a stimulus, without conscious thought
Example
The baby's reflex actions were tested by the pediatrician.
reflex arc
the neural pathway that mediates a reflex action
Example
The reflex arc involves the sensory neuron, interneuron, and motor neuron.

Origins of reflex

from Latin 'reflexus', meaning 'bent back'

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Summary: reflex in Brief

A 'reflex' [ˈriːflɛks] is an automatic and unconscious reaction to a stimulus. It can be a physical response, like when a doctor tests your reflexes, or a more abstract response, like apologizing when you make a mistake. The phrase 'knee-jerk reflex' describes a negative or defensive reaction, while 'reflex action' refers to an immediate and automatic response without conscious thought.