Definition of watershed

reciprocate Definition: (verb) to make a return for something. Petersons.com

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< water scorpion

water shield >

wa·ter·shed    (wôtr-shd, wtr-) KEY  

NOUN:

1. A ridge of high land dividing two areas that are drained by different river systems. Also called water parting .
2. The region draining into a river, river system, or other body of water.
3. A critical point that marks a division or a change of course; a turning point: "a watershed in modern American history, a time that ... forever changed American social attitudes" (Robert Reinhold).

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ETYMOLOGY:
Probably translation of German Wasserscheide : Wasser, water + Scheide, divide, parting

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