Definitions for "Turning point"
An AT cut crystal has a temperature vs. frequency characteristic that can be represented by a third order polynomial. The turning points are points of zero slope where the slope reverses sign. Usually there is a lower turning point around -4° C and an upper turning point around +55° C. Often ovenized oscillators hold the temperature of the crystal at the upper turning point to obtain maximum temperature stability.
In the growth cycles analysis, a turning point occur in a series when the deviation-from-trend series reached a local maximum (Peak) or a local minimum (Trough). Growth cycle peaks (end of expansion) occur when activity is furthest above its trend level. Growth cycle troughs (end of contraction/recession) occur when activity is furthest below its trend level.
a maximum or minimum point on a curve where the y-value changes from increasing to decreasing or vice versa (and the tangent is horizontal).
an initiative funded by The Robert Wood Johnson Foundation (RWJF) and the W
an event marking a unique or important historical change of course or one on which important developments depend; "the agreement was a watershed in the history of both nations"
a major event that changes the course of the plot and the protagonists must act or react
an important moment of change
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an event, decision, or choice that took you in a particular direction
the intersection of two streets; "standing on the corner watching all the girls go by"