each other

pronoun

: each of two or more in reciprocal action or relation

looked at each other in surprise

Each Other vs. One Another: Usage Guide

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.

Word History

First Known Use

before the 12th century, in the meaning defined above

Kids Definition

each other

pronoun

: each of two or more participating in a shared action or relation

they turned and looked at each other