Dictionary

each other

pronoun

: each of two or more people, animals, etc., who are doing something together or in relationship to the other or others in the group

Full Definition of EACH OTHER

:  each of two or more in reciprocal action or relation <looked at each other in surprise>

Usage Discussion of EACH OTHER

Some handbooks and textbooks recommend that each other be restricted to reference to two and one another to reference to three or more. The distinction, while neat, is not observed in actual usage. Each other and one another are used interchangeably by good writers and have been since at least the 16th century.
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First Known Use of EACH OTHER

before 12th century
EACH OTHER Defined for Kids

each other

pronoun

Definition of EACH OTHER for Kids

:  each of two or more in a shared action or relationship <They greeted each other.>

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