A metre is a unit of length. When Lucy Barker introduced herself to Brian Johnson, he asked her if she had been very short for long, she replied that she wasn't that short being nine. Brian asked her if that was metres, inches, or feet. A confused Lucy explained she was nine years old. Brian remarked, in attempt to bring himself back into human normality, "Obviously." (Aliens Go Home)

Wikipedia has a more detailed and comprehensive article on Metre

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