ephemeris
/ɪˈfɛməɹɪs/
"ephemeris" is a 9-letter English headword indexed on PlainSpell.
The verdict
“ephemeris” is uncommon English (frequency #86,248 among 18,836 “E” headwords), classed as a noun. The kind of spelling people second-guess.
- #86,248
- frequency rank, English
- 18,836
- “E” headwords
According to Wiktionary data (CC BY-SA, analyzed May 6, 2026) - A journal or diary.
| Property | Value |
|---|---|
| Headword | ephemeris |
| Language | English |
| Part of speech | Noun |
| IPA | /ɪˈfɛməɹɪs/ |
| Letters | 9 |
| Frequency rank | #86,248 |
| Misspellings tracked | 0 |
| Confusable pairs | 0 |
| Source | Wiktionary (kaikki.org) |
Where “ephemeris” sits in English frequency
Rare enough to double-check
ephemeris is uncommon English at frequency #86,248 among 18,836 “E” headwords, classed as anoun, transcribed /ɪˈfɛməɹɪs/. Rarity is why readers land here mid-draft. 3 senses are on record.
ephemeris has no tracked misspelling variants, since its letter pattern doesn't lend itself to common typo substitutions. Our dataset records no confusable match here, which usually means its spelling is distinct enough that readers don't reach for a similar-looking word instead.
Etymologically, the entry records: From New Latin ephēmeris, from Ancient Greek ἐφημερίς (ephēmerís, “diary, calendar”), from ἐφήμερος (ephḗmeros, “daily”). The correct English form is ephemeris, spelled E-P-H-E-M-E-R-I-S.
Definition
- 1A journal or diary.
- 2A table giving the apparent position of celestial bodies throughout the year; normally given as right ascension and declination.
- 3Computer software that calculates the apparent position of celestial bodies.
Etymology
From New Latin ephēmeris, from Ancient Greek ἐφημερίς (ephēmerís, “diary, calendar”), from ἐφήμερος (ephḗmeros, “daily”).
This word in other languages
Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.
Frequently Asked Questions
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Using “ephemeris”
The practical upshot for anyone who landed here from a spell-check.
- The one correct English spelling is E-P-H-E-M-E-R-I-S - every other letter order is a misspelling in standard orthography.
- Say it as /ɪˈfɛməɹɪs/ (IPA); tap the speaker on the pronunciation badge to hear it where audio exists.
- Browse more English words and confusable pairs in the same reference. English words
Other uncommon English words near this rank
Data Source
Wiktionary (via kaikki.org), licensed under CC BY-SA & GFDL. Word ordering uses an open word-frequency list; misspelling variants are generated by edit-distance from the correct headword.