(Myr or Ma)
   a unit of time equal to one million years.

Dictionary of units of measurement. 2015.

Look at other dictionaries:

  • megayear — noun A million (10) years After three hours the machine had not printed its response to the first input pattern; evidently the rate of learning under these conditions is very low (we judge it to be on the order of 10 concepts for megayear) …   Wiktionary

  • gigayear — noun A billion (10) years These syntheses gave a fresh geological, as opposed to solely geophysical, view of the up to multi megayear and near gigayear mechanism responsble for the palimpsests of a general process of change in the upper crust: a… …   Wiktionary

  • darwin —    a logarithmic unit measuring the rate of evolution in characteristics of organisms. If the measurement of a characteristic (such as length, for example) changes from a to b in y million years, then the rate of evolution is (ln b ln a)/y… …   Dictionary of units of measurement

  • Ma —    1. see megayear    2. see Mach    3. a symbol for one million years, often used in astronomy and geology. The a stands for the Latin annum …   Dictionary of units of measurement

  • Myr —    see megayear …   Dictionary of units of measurement

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