1. a combining form meaning “tenth,” used in words denoting units of the metric system (deciliter); on this model, extended to other systems (decibel).


  1. denoting one tenth; 10 –1decimetre Symbol: d

in the metric system, word-forming element denoting weights of one-tenth of the standard unit of measure, 1801, from French deci-, taken arbitrarily from Latin decimus “tenth,” from decem “ten” (see ten).


  1. One tenth (10-1):decibel.

  1. A prefix that means “one tenth,” as in deciliter, one tenth of a liter.

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