Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • adjective Of, relating to, or being an unstable but relatively long-lived state of a chemical or physical system, as of a supersaturated solution or an excited atom.

from The Century Dictionary.

  • In phys. ehem., having a stability of such sort that a minute impressed change of conditions may produce a disturbance not proportional to the impressed change.
  • In thermodynamics, in a state intermediate between stable equilibrium and unstable equilibrium, but approaching stability as nearly as the conditions will permit.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective physics, chemistry Of or pertaining to a physical or chemical state that is relatively long-lived, but may decay to a lower energy state when slightly perturbed or through a quantum transition.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective (of physical systems) continuing in its present state of equilibrium unless sufficiently disturbed to pass to a more stable state of equilibrium

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

meta- +‎ stable

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Examples

  • This spring (a period of great disappointment for our farmers) was a period of the so-called metastable conditions of rain clouds.

    Ferghana.Ru news agency 2009

  • This spring (a period of great disappointment for our farmers) was a period of the so-called metastable conditions of rain clouds.

    Ferghana.Ru news agency 2009

  • This spring (a period of great disappointment for our farmers) was a period of the so-called metastable conditions of rain clouds.

    Ferghana.Ru news agency 2009

  • This spring (a period of great disappointment for our farmers) was a period of the so-called metastable conditions of rain clouds.

    Ferghana.Ru news agency 2009

  • They manipulate the water in the xylem under negative pressure - what's called a metastable liquid state - right on the verge of becoming a vapor.

    The Open Piehole 2008

  • Setup or hold violations cause the output of the flip-flop to enter a symmetrically balanced transient state, called a metastable state.

    EE Times-Asia 2008

  • Technetium-99m, where "m" stands for "metastable" -, one resorts to another isotope, Molybdenum-99.

    Backreaction 2008

  • They manipulate the water in the xylem under negative pressure - what's called a metastable liquid state - right on the verge of becoming a vapor.

    The Open Piehole 2008

  • In this case, the anchoring and hence the unfriendliness/inconvenience for speculation would also mean that the currency regime would become "metastable" as market hedging is more difficult -- but this is a minor inconvenience as one can still speculate/hedge even on a fixed peg e.g. non-deliverable forward for RMB

    Archive 2006-08-01 Sun Bin 2006

  • In this case, the anchoring and hence the unfriendliness/inconvenience for speculation would also mean that the currency regime would become "metastable" as market hedging is more difficult -- but this is a minor inconvenience as one can still speculate/hedge even on a fixed peg e.g. non-deliverable forward for RMB

    Commodity peg to export price vs peg to import price Sun Bin 2006

  • Metastable failures borrow their name from physics, where metastable means something that looks stable but isn’t.

    Metastable Failures Explained: Why Fixing the Trigger Fails Teiva Harsanyi 2026

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