Immediately
Immediately conjunction - Just at the moment that.
Usage example: give us a ring immediately you get back
Once is a synonym for immediately. In some cases you can use "Once" instead the word "Immediately" as a conjunction or an adverb.
Once
Once conjunction - Just at the moment that.
Usage example: you should have stopped wrestling once you knew someone was getting hurt, not five minutes later
Immediately is a synonym for once (British) in as soon as topic. You can use "Immediately" instead the word "Once" as a conjunction or an adverb. informal substitute
Mutual synonyms
Both words in one sentence
- In NetHack poison isn't a status effect, but deals a certain amount of damage once and immediately, with a chance of reducing the victim's strength attribute.
Source: Universal Poison - Miku eats a leek once and immediately starts craving more.
Source: Web Video / SHION -
More than once, his opponents immediately backed away or tried to run once they realized who they were dealing with.
Source: Film / Once Upon a Time in China
Cite this Source
Once and Immediately. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/immediately/once
Immediately & Once. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/immediately/once>.
Once or Immediately. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/immediately/once.
Google Ngram Viewer shows how "immediately" and "once" have occurred on timeline