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1. Oxford American Dictionary

   fundamental unit

   • IPA[ˌfəndəˌmen(t)l ˈyo͞onət]

   • n.
     one of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. For example, in the SI system the fundamental units are the meter, kilogram, and second.；a thing that is or is perceived as being the smallest part into which a complex whole can be analyzed

   • noun: fundamental unit, plural noun: fundamental units

2. • 釋義

   n.

   名詞

   • 1. one of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. For example, in the SI system the fundamental units are the meter, kilogram, and second.
   • ▪ a thing that is or is perceived as being the smallest part into which a complex whole can be analyzed the house is the fundamental unit of Basque society