apoapsis
noun
apoapsis is spelled A-P-O-A-P-S-I-S: 8 letters. It appears about once in every 65 million words in written English, the 252,559th most frequent word form (wordfreq, 2021 data). As a noun, apoapsis means “The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its maximum” (English Wiktionary, September 2026). The plural of apoapsis is apoapsides or apoapsises.
How many letters and syllables are in apoapsis?
| Letters | 8: A-P-O-A-P-S-I-S |
|---|---|
| In writing | about once in every 65 million words; the 252,559th most frequent word form |
| Wrong spellings searched | none measured in search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How common is apoapsis?
Apoapsis appears about once in every 65 million words in written English, the 252,559th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
Forms of apoapsis
- apoapsides plural
- apoapsises plural
- apoapses plural
- apapsis
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does apoapsis mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
The point of a body's elliptical orbit about the system's centre of mass where the distance between the body and the centre of mass is at its maximum.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Apoapsis in Spanish, French, German and Portuguese
In the sense point of a body's elliptical orbit:
| Language | Words |
|---|---|
| French | apoapse, apoapside |
| Portuguese | apoapside |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does apoapsis come from?
From apo- + apsis.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).