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Pronunciation varies by accent · noun
A contour line connecting all points in valley at the same elevation as the keypoint, used in planning efficient water usage..
Use keyline when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Keyline means A contour line connecting all points in valley at the same elevation as the keypoint, used in planning efficient water usage..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use keyline where its definition matches the intended context.
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