WordNet records no synonym and no antonym for emulate. It is the only member of each of its synsets, 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.
strive to equal or match, especially by imitating
“He is emulating the skating skills of his older sister”
imitate the function of (another system), as by modifying the hardware or the software
compete with successfully; approach or reach equality with
“This artist's drawings cannot emulate his water colors”
Synonyms, antonyms and the broader and narrower relations for emulate come from Princeton University’s WordNet. Full sources and licences.