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WordNet records no synonym and no antonym for ecliptic. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
the great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator
“all of the planets rotate the sun in approximately the same ecliptic”
Synonyms, antonyms and the broader and narrower relations for ecliptic come from Princeton University’s WordNet. Full sources and licences.