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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ephemeris is a noun meaning "an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year". It carries one recorded sense.
an annual publication containing astronomical tables that give the positions of the celestial bodies throughout the year
“today computers calculate the ephemerides”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ephemeris come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.