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Noun: universal metre
Usage: Brit, Cdn (US: universal meter)
  1. A unit of length equivalent to the length of a free seconds pendulum; differs from the modern metre by half a centimetre, introduced by Tito Livio Burattini in 1675.
    - catholic meter [US], catholic metre [Brit, Cdn], metro cattolico, universal meter [US]

Type of: linear measure, linear unit