SINCE 1828

An Encyclopædia Britannica Company

let alone

conjunction

Definition of let alone

: to say nothing of : not to mention —used especially to emphasize the improbability of a contrasting example he would never walk again let alone play golf — Sports Illus. how many ever see an Ambassador or Minister, let alone a President — Robert Lacville

See let alone defined for kids

Examples of let alone in a Sentence

I don't have enough money for a new car, let alone a luxury sedan.

First Known Use of let alone

1765

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Thesaurus: All synonyms and antonyms for let alone

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Examples: let alone in a Sentence