Definition of soldier for Students. : a person in military service and especially an enlisted person who is in the army.
Zeitgeist is defined as the spirit of a generation or a period of time. An example of zeitgeist is the free love and progressive thinking of the 1960s. the spirit of the age; trend of thought and feeling in a period. Origin of zeitgeist.
In psychiatry, the social zeitgeber theory argues that social life provides important social cues that entrain circadian rhythms. Disturbance of these social cues might lead do dis-entrainment of circadian rhythms and evoke somatic symptoms that increase the risk of mood disorders.