rotations

a structured program used by some STEM departments to allow students to spend time in multiple research groups prior to choosing a research home for their graduate degree(s). Students will move (or “rotate”) through the groups they are interested in. Emory requires three rotations. Importantly, schools with rotation programs will probably not allow or require you to apply directly to a single faculty member. Instead, all students will be accept to “rotate.” However, some programs offer a choice of enrolling immediately in a lab or completing rotations.

Emory Chem handbook on rotations