once

The word “once” means on one occasion only; a single time. In plain terms, one single time, or formerly, or "as soon as.".

“Once” is pronounced wuhns (/wʌn(t)s/ in IPA).

Here is “once” used in a sentence: “I've only been to Paris once.”

Words with a similar meaning to “once” include oncet, yance and wunst.

The opposite of “once” — its antonyms — are four times, often, thrice and twice.

Depending on how it is used, “once” can be an adverb and a conjunction.

The word “once” comes from Old English. From Old English aenes, an extension of aene ("one time") with a genitive -s ending, related to "one.".

“Once” is a very common word in modern English, usually learned at around the A1 level.

Both mean on a single occasion and are often interchangeable: 'I've only been there once' equals 'one time.' 'Once' is more concise and idiomatic, while 'one time' can add mild emphasis or a casual tone. 'Once' also carries extra meanings that 'one time' does not.

No. Besides 'on one occasion,' 'once' can mean 'formerly' or 'in the past', as in 'this was once a farm', and, as a conjunction, 'as soon as': 'once you finish, call me.' The phrase 'once upon a time' uses that earlier-time sense.

'I only met her once,' 'Take the tablet once a day,' or 'He knocked just once.' In each case 'once' fixes the number of occasions at exactly one. It answers the question 'how many times?' with the smallest possible countable answer.