momentary suggests coming and going quickly and therefore being merely a brief interruption of a more enduring state.

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He accidentally forgot two students' names and hastily added them at the end -- a momentary omission that inflicted him with lasting embarrassment.

Momentary definition: lasting but a moment; very brief; fleeting.. See examples of MOMENTARY used in a sentence.

Something that is momentary lasts for a very short period of time, for example for a few seconds or less. ...a momentary lapse of concentration. His hesitation was only momentary.

Nov 29, 2025 · momentary (comparative more momentary, superlative most momentary) Lasting for only a moment. (obsolete) Happening at every moment; perpetual. Ephemeral or relatively short-lived. …

1. Lasting for only a moment. 2. Occurring or present at every moment: in momentary fear of being exposed. 3. Short-lived or ephemeral, as a life.

Some common synonyms of momentary are ephemeral, evanescent, fleeting, fugitive, transient, and transitory. While all these words mean "lasting or staying only a short time," momentary suggests …

Use the adjective momentary when you want to describe something brief or fleeting, like a momentary pause in a speech or a momentary flash of insight that pops into your head and disappears. If it lasts …

There are seven meanings listed in OED's entry for the word momentary, six of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.