• An act, instance of, or state of expansion or increase in size, especially by injection of a gas.
  • An increase in the general level of prices or in the cost of living.
  • A decline in the value of money.
  • An increase in the quantity of money, leading to a devaluation of existing money.
  • Undue expansion or increase, as of academic grades.
  • An extremely rapid expansion of the universe, theorized to have occurred very shortly after the big bang.


Opposite words


  • From Middle English, borrowed from Old French inflation ("swelling"), from Latin īnflātiō ("expansion", "blowing up"), from īnflātus, the perfect passive participle of īnflō, from in + flō.
  • Morphologically inflate + -ion.

Modern English dictionary

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