Watershed

Part of speech: noun

Pronunciation: /ˈwɔːtəʃɛd/

Definitions

1. A critical turning point that marks a significant division or change in a course of events or situation
2. A crucial moment that signifies a major change or separation in a process, often impacting future developments or outcomes
3. An important juncture that indicates a distinct shift or divide in circumstances, influencing the trajectory of events

Etymology: The "shed" in "watershed" has nothing to do with a garden building. It is the older sense of "shed" meaning to divide or separate, as in shedding light or shedding water, and in this word it marks the line where rain runs off in one direction or the other. A watershed was originally a ridge of high ground that divides one drainage basin from another, so that water falling on one side flows to one river system and water on the far side flows to another. The word was formed as a calque of German "Wasserscheide," which uses the same two parts, "Wasser" (water) and "Scheide" (dividing line). English took the idea and built it from its own words, so the geographic sense came first and the figurative sense followed from it. The move to "turning point" rests on the same image: a ridge decides which way the water goes, and a decisive moment decides which way a situation will go.

Synonyms: turning point, crucial point