attosecond
noun
attosecond is spelled A-T-T-O-S-E-C-O-N-D: 10 letters. It appears about once in every 33 million words in written English, the 176,009th most frequent word form (wordfreq, 2021 data). As a noun, attosecond means “An SI unit of time equal to 10⁻¹⁸ seconds. Symbol: as” (English Wiktionary, September 2026). The plural of attosecond is attoseconds.
How many letters and syllables are in attosecond?
| Letters | 10: A-T-T-O-S-E-C-O-N-D |
|---|---|
| In writing | about once in every 33 million words; the 176,009th 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 attosecond?
Attosecond appears about once in every 33 million words in written English, the 176,009th 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 attosecond
- attoseconds plural
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does attosecond mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
An SI unit of time equal to 10⁻¹⁸ seconds. Symbol: as
Holonyms: femtosecond < picosecond < nanosecond < microsecond < millisecond < centisecond < decisecond < second < decasecond < minute < hectosecond < kilosecond < hour < day < week < megasecond < fortnight < month < year < gigasecond < cent
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Where does attosecond come from?
From atto- + second.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).