Visual observer
Visual observer means a person who is designated by the remote pilot in command to assist the remote pilot in command and the person manipulating the flight controls of the small UAS to see and avoid other air traffic or objects aloft or on the ground.
Source
14 CFR § 107.3
Scoping language
The following definitions apply to this part. If there is a conflict between the definitions of this part and definitions specified in 1.1 of this chapter, the definitions in this part control for purposes of this part: