All 5 Uses of "apex" in "The Three-Body Problem"

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All 5 Uses

apex
in
The Three-Body Problem
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But next to it, there was now a staircase carved into the pyramid leading all the way to the apex.
p. 140.1 *

apex = highest point
Wang climbed up the stairs and reached the apex.†
p. 140.1
It had a Gothic-style apex, stabbing straight into the morning sky, recalling St. Joseph's Church at Wangfujing.†
p. 181.9
Output is the apex.†
p. 212.1
Qin Shi Huang, Newton, Von Neumann, and Wang all stood on the platform at the apex of the pyramid.
p. 213.6

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Definitions:

(1) (apex)
the highest point or most important level of something
(2) (meaning too rare to warrant focus)
The "highest point" can be physical or metaphorical -- as in the apex of his career.

Much more rarely, "Apex" is used in the travel industry as an acronym for "advance-purchase excursion"; i.e., to reference tickets that are discounted due to advance purchase.