Z

zaftig (adjective)
Of a woman:  Having a full, rounded figure; plump. (OD)
Pleasingly plump. (MW)
Alluringly voluptuous and curvaceous.  Having a full, shapely figure. (WN)
Note:  From Yiddish

zeitgeist (noun)
The defining spirit or mood of a particular period of history as shown by the ideas and beliefs of the time. (OD)
The general intellectual, moral, and cultural climate of an era. (MW)

zephyr (noun)
A breeze from the west; a gentle breeze. (MW)

zero-sum (adjective)
Of, relating to, or being a situation (such as a game or relationship) in which a gain for one side entails a corresponding loss for the other side. (MW)
Relating to or denoting a situation in which whatever is gained by one side is lost by the other. (OD)
In game theory:  Designating a game in which whatever is gained by one side is lost by the other, so that the net change is always zero.  More generally:  Designating any situation in which an advantage to one participant necessarily leads to a disadvantage to one or more of the others.  Especially in zero-sum game. (OED)

zero-sum game (noun)
A situation in which one person or group can win something only by causing another person or group to lose it. (MW)

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