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Pronunciation varies by accent · noun
(astronomy) The middle to highest point of a part of an ecliptic that is above the horizon at any period of time..
Use nonagesimal when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Nonagesimal means (astronomy) The middle to highest point of a part of an ecliptic that is above the horizon at any period of time..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use nonagesimal where its definition matches the intended context.
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