Meaning & use

reflex

noun·Academic

An automatic, involuntary reaction of the body to a particular stimulus.

See it in a sentence

The doctor tapped his knee to test his reflex during the checkup.

Good reflexes helped the goalkeeper block the sudden shot on goal.

A note on using this word

A reflex happens without conscious thought, unlike a deliberate reaction, which involves some decision-making.

Words with a similar meaning

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