watershed

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈwɔːtə^rʃɛd/

US:USA pronunciation: IPAUSA pronunciation: IPA/ˈwɔtɚˌʃɛd, ˈwɑtɚ-/

US:USA pronunciation: respellingUSA pronunciation: respelling(wô′tər shed′, wot′ər-)

wa•ter•shed /ˈwɔtɚˌʃɛd, ˈwɑtɚ-/USA pronunciation n. [countable]

Geographya region or area drained by a river or stream.
Geography, British Termsa ridge or high area dividing two drainage areas.
an important point of division or change:a watershed in international relations.

wa•ter•shed (wô′tər shed′, wot′ər-),USA pronunciation n.

Geography, British Terms[Chiefly Brit.]the ridge or crest line dividing two drainage areas;
water parting;
divide.
Geographythe region or area drained by a river, stream, etc.;
drainage area.
Architecturewash (def. 48).
an important point of division or transition between two phases, conditions, etc.:The treaty to ban war in space may prove to be one of history's great watersheds.

adj.

Collins Concise English Dictionary © HarperCollins Publishers::

watershed /ˈwɔːtəˌʃɛd/ n

'watershed' also found in these entries (note: many are not synonyms or translations):

Collocations: a [river, valley, mountain] watershed, the [hill, valley] acts as a watershed, the watershed of the [Mississippi], more...

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