Z

zaftig (adjective)
Of a woman:  Having a full, rounded figure; plump. (NOA)
Pleasingly plump. (MW)
Alluringly voluptuous and curvaceous.  Having a full, shapely figure. (WN)
Having a full, shapely figure. (AHD)
Usually of a woman, plump, buxom. (Green's)
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. (NOA)
The general intellectual, moral, and cultural climate of an era. (MW)
The spirit of the time; the taste and outlook characteristic of a period or generation. (AHD)

zephyr (noun)
A breeze from the west; a gentle breeze. (MW)
The west wind.  A gentle breeze.  Something that is airy, insubstantial, or passing. (AHD)

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. (NOA)
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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