Hovering a stationary hover is a maneuver in which the helicopter is maintained in nearly motionless flight over a reference point at a constant altitude and on a constant
heading.
https://www.faa.gov/regulations_poli...a/hfh_ch09.pdf
AC 27.49. § 27.49 (Former § 27.73) (Amendment 27-44) Performance at Minimum Operating Speed. (For § 27.73 prior to Amendment 27-44, see AC 27.73) a. Explanation. Amendment 27-44 adds a requirement to determine out-of-groundeffect (OGE) hover performance. Once reserved for special missions, OGE operations are now a common practice.
(1) The word "hover" applies to a helicopter that is airborne at a given altitude over a fixed geographical point regardless of wind. Pure hover is accomplished only in still air. For the purpose of this manual, the word "hover" will mean pure hover.
https://www.faa.gov/documentLibrary/...thru_Chg_6.pdf