In step is a phrase used to describe something that is synchronized, aligned, or in harmony with something else. Synonyms for in step include matching, concurrent, parallel, coordinated, synchronous, and in sync. These words can be used interchangeably to indicate that things are happening at the same time, in relation to one another, and in a harmonious manner. Other synonyms for in step include in tune, in rhythm, in time, and in beat. By using synonyms for in step, you can add variety to your writing while still conveying the same idea of synchronization and harmony.