online
/ˈɒnlaɪn/adjective, adverb, verb
online is spelled O-N-L-I-N-E: 6 letters and 2 syllables. It appears 155 times per million words in written English, the 657th most frequent word form (wordfreq, 2021 data). People search “on-line vs online” about 880 times a month (Google, United States). As an adjective, online means “Of a generator or power plant: connected to the grid” (English Wiktionary, September 2026).
How many letters and syllables are in online?
| Letters | 6: O-N-L-I-N-E |
|---|---|
| Syllables | 2 (from its American pronunciation) |
| In writing | 155 times per million words; the 657th most frequent word form |
| Wrong spellings searched | none measured in search |
| Pairs people search |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation and the CMU Pronouncing Dictionary; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); Bing searches in the United States: the average month from September 2025 to August 2026 (Microsoft Advertising keyword data through DataForSEO, read September 30, 2026).
How common is online?
Online appears 155 times per million words in written English, the 657th 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).
How do you pronounce online?
- UK /ˈɒnlaɪn/
- British /ˈɔnlɑjn/
- /ˈɑnlaɪn/
Online has 2 syllables (counted from its American pronunciation in the CMU Pronouncing Dictionary).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-us-online.ogg, Wikimedia Commons (author and licence on each file's page).
Words people confuse with online
Word pairs people search, with the monthly searches for “a vs b” (G: Google, B: Bing, United States).
Also written: on-line (one word or two).
Sources: Google and Bing searches (September 2025 to August 2026, through DataForSEO); English Wiktionary (homophones, alternative spellings).
Forms of online
- more online comparative
- most online superlative
- onlines present, singular, he/she/it
- onlining participle, present
- onlined participle, past
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does online mean?
The meanings the English Wiktionary records, quoted as written there (source below).
adjective
- 1
Of a generator or power plant: connected to the grid.
- 2
Of a computer: actively connected to the Internet or to some other communications service.
Is this modem online?
- 3
Available over, or delivered from, the Internet.
I prefer to read online newspapers.
- 4
Connected to the Internet.
I'll be online tonight, so I'll be able to reply to your email.
- 5
Available on a computer system, even if not networked.
Press the F1 key to access the online help.
- 6
Of a system: active, particularly building facilities (such as power) or a factory or power plant.
The power is online.
- 7
slangImmersed in Internet culture. (Usually modified by an intensifier such as extremely or terminally)
terminally online
- 8
Able to process an input piece-by-piece without needing to have the entire input available to it from the start.
adverb
- 1
While online; while in a running or active state, or connected to the Internet.
He works online.
verb
- 1
To bring (a system, etc.) online; to promote to an active or running state.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
How do you abbreviate online?
Wiktionary records one abbreviation of online: OL.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Online in Spanish, French, German and Portuguese
| Language | Words |
|---|---|
| French | en ligne |
| German | online, angeschlossen , eingeschaltet |
| Portuguese | online, em linha , ativo |
| Spanish | a distancia, internáutico, internauta, por internet , en línea, online |
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 online come from?
1950, from on + line.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).