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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.

[Middle English momentare, from Latin mōmentārius, from mōmentum, moment; see moment.]

mo′men·tar′i·ness n.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
According to the basic Buddhist teachings of momentariness and non-self, even what we take as established trans-temporal entities, like our own self, has no real existence but constitutes only a series of interlocking moments.
Since the spatial narrative is about today's people and their living conditions, to be specific, Fang believes that the spatial narrative contains the following three aspects: 1) occasionality of life; 2) momentariness of reality; 3) spatiality of existence (149).
Even though Bollnow's overall concern is not one of aesthetics, in these sections of his book in particular he turns to poetry in order to illustrate the coincidence of momentariness and timelessness in experiences of extraordinary happiness.
Joel Feldman discusses the Buddhist doctrine of momentariness. Things do not endure.
Instantaneous fairness has been used as a specific terminology to emphasize momentariness. Fairness means the quality of equal resource sharing, and when fairness is used alone, it usually signifies long-term fairness, in which equal sharing is considered for an interval long enough for the system to go into a stable state.
In envisaging himself as a writer of playbills and God's theater manager, Coleridge was expressing the power of ephemerality as a way of apprehending or actualizing the "thisness" or haeccity of time: as the New Monthly Magazine writer said of John Genest: one could "look," "file," and "extract," and the momentariness of experience might still be there.
That doom, and the classic poetic trope of the momentariness of beauty, is then exported out of the poem into the life of Lu Xun in the form of an implicit instruction that he not be protected or made to avoid active engagement in arts and politics.
In particular the pessimistic ideas expressed by Spengler, emphasizing that men would be unable to sustain creativity and the motif of the "irreversibility of life and the momentariness of the individual in history, as well as civilizations" left lasting impressions on Kissinger.
Sautrantika Buddhism adopts radical momentariness. Nirvana is seen as an absence of suffering.
(The twins themselves are doubled in a detail whose momentariness a psychoanalyst would deem significant, the later appearance of an old couple who "had lived together so long (...) that they looked as similar as twins" [42].) Moreover, like Persona, McCullers' story is interested in the photograph: the mention of the twins is followed closely by that of a photograph of two children of near-equal age whose faces seem to be indeterminate, "tiny white blurs" (8).
How can determinism be ultimatese if all nomological relations are minimally dyadic and moments-spanning, which contradicts the Buddhist idea that momentariness undermines the ultimate status of anything moments-spanning?