N: 1. Also jetlag, 1966, from “jet” (1690s, “stream of water,” from French jet “a throw, a cast; a gush, spurt (of water); a shoot (of a plant),” from jeter “to throw, thrust”; Middle English had jet/get “a device, mode, manner, fashion, style”, early 14c.) in the “airplane” sense + “lag” (in the mechanical sense “retardation of movement,” 1855, from “lag” as a verb). Also known in early days as time zone syndrome.
- Adjective: jet-lagged.
2. Jet lag, physiological desynchronization caused by transmeridian (east-west) travel between different time zones. The severity and extent of jet lag vary according to the number of time zones crossed as well as the direction of travel—most people find it difficult to travel eastward (i.e., to adapt to a shorter day as opposed to a longer one). The resulting symptoms include extreme fatigue, sleep disturbances, loss of concentration, disorientation, malaise, sluggishness, gastrointestinal upset, and loss of appetite.
3. Medical Definition of “jet lag”: A condition that is characterized by various psychological and physiological effects (as fatigue and irritability), occurs following long flight through several time zones, and probably results from disruption of circadian rhythms in the human body.
Called also “jet fatigue”.
4. Air Transport and Nervous System: An alteration in biologic rhythm due to rapid transport, as by jet aircraft, from one time zone to another. Patterns of sleep and wakefulness and of hunger and satiety are often temporarily disrupted, producing disorientation and fatigue.
S: 1. OED – https://bit.ly/2FHfWW2 (last access: 25 November 2018); MW – https://bit.ly/2QgILwB (last access: 25 November 2018). 2. EncBrit – https://bit.ly/2DG0vLb (last access: 25 November 2018). 3. MW – https://bit.ly/2QgILwB (last access: 25 November 2018). 4. TERMIUM PLUS – https://bit.ly/2TIaFRa (last access: 25 November 2018).
S: OED – https://bit.ly/2FHfWW2 (last access: 25 November 2018)
SYN: jet fatigue (depending on field and context)
S: MW – https://bit.ly/2QgILwB (last access: 25 November 2018)