At once
At once adverb - Without delay or hesitation; with no time intervening.
Later is an antonym for at once in topics: immediately, directly, presently, instantaneous, right now.
Later
Later adjective - Being, occurring, or carried out at a time after something else.
Both terms in one sentence
- Referenced later, when Kuyou attempts to swallow a whole plate of noodles at once (and chokes), and Kyon refuses to elaborate when asked about it later.
Source: Noodle Incident / Fan Works - Later on, when he learns his friends have been captured by the Big Bad, he immediately storms the place where they're being held and takes on the entire Order at once.
Source: Papa Wolf / Fan Fic - In later frames, she straightens up and skillfully handles multiple plates at once.
Source: Webcomic / Blood Stain
Cite this Source
Later and At once. (2016). Retrieved 2026, August 15, from https://thesaurus.plus/related/at_once/later
At once & Later. N.p., 2016. Web. 15 Aug. 2026. <https://thesaurus.plus/related/at_once/later>.
Later or At once. 2016. Accessed August 15, 2026. https://thesaurus.plus/related/at_once/later.
Google Ngram Viewer shows how "at once" and "later" have occurred on timeline