Übersetzung für at this instant im Englisch-Deutsch-Wörterbuch tricksfuumlrbookofra.win. Instant definition, an infinitesimal or very short space of time; a moment: They arrived not an instant too soon. See more. A period of time so short as to be almost imperceptible. See Synonyms at moment. 2. A particular or precise time: at the instant of combustion. 3. Abbr. inst.