turning point

noun
1.
a point at which a decisive change takes place; critical point; crisis.
2.
a point at which something changes direction, especially a high or low point on a graph.
3.
Surveying. a point temporarily located and marked in order to establish the elevation or position of a surveying instrument at a new station.

Origin:
1850–55

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To turning point
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World English Dictionary
turning point
 
n
1.  a moment when the course of events is changed: the turning point of his career
2.  a point at which there is a change in direction or motion
3.  maths a stationary point at which the first derivative of a function changes sign, so that typically its graph does not cross a horizontal tangent
4.  surveying a point to which a foresight and a backsight are taken in levelling; change point

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
Turning point is always a great word to know.
So is zedonk. Does it mean:
a fool or simpleton; ninny.
the offspring of a zebra and a donkey.
Example sentences
Last week marked a turning point for the beer industry.
Even if last week's adjustment was timid, it could mark an important turning
  point.
It was a turning point in the fortunes of a government that has lived a charmed
  life with the electorate up to now.
The turning point seems to have come with the generation born in the
  nineteen-forties.
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